After that huge update yesterday (the one with the most games, too, thanks to the all-new MSX section with 19 new games), I thought we ended up with 4999 maps.
But then I remembered that Rick Bruns's interactive Legend Of Zelda flash map doesn't show up in CompuPic Pro! So we had actually hit 5000, and the 5000th map was also Rick Bruns's!
So I'll dig up the 4000th map topic from the old forum topics and provide an updated list of the statistics, since someone mentioned that they liked that. (EDIT: Darn, I can't find that topic, but that's okay, I can come up with those stats again.) The smallest and largest maps may have changed not only because of new maps but because of the mega PNG optimization that I did a while ago.
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1000th map: Pokemon: FireRed/LeafGreen Versions (GBA) - Route 01 (Jaromaru)
2000th map: Aunt Arctic Adventure (Amiga) - Level 39 (Grizzly)
3000th map: Alien Syndrome (NES) - Round 6 (KingKuros)
4000th map: The 7th Saga (Super NES) - Kingdom Of Bilthem (KingKuros)
5000th map: Lufia II: Rise Of The Sinistrals (Super NES) - Lake Cave (Rick Bruns)
Alphabetically first map: 7th Saga (Super NES) - Castle Of Aran - Basement (KingKuros)
Alphabetically last map: ZZT (PC) - Town Of ZZT - ZZT Palace (RT-55J)
Shortest map (pixels): 48 pixels - Resident Evil (PC) - Laboratory - B2 (Matis Casco)
Tallest map (pixels): 25,960 pixels - Bubble Bobble (NES) - Map & Guide (mephea)
Tallest map / shortest map = 540.83 times taller
Skinniest map (pixels): 72 pixels - Resident Evil (PC) - Laboratory - B2 (Matis Casco)
Fattest (pixels): 23920 pixels - Akumajo Dracula X: Chi no Rondo (Castlevania: Rondo Of Blood) (J) (TurboGrafx 16) - Stage 0 - Prologue (Zeric)
Fattest map / skinniest map = 332.22 times fatter
Tallest/skinniest map (ratio): 8:367 - Adventures In The Magic Kingdom (NES) - Autopia (Grizzly)
Shortest/fattest map (ratio): 1495:31 - Akumajo Dracula X: Chi no Rondo (Castlevania: Rondo Of Blood) (J) (TurboGrafx 16) - Stage 0 - Prologue (Zeric)
Smallest map (filesize): 170 bytes - Resident Evil: Survivor (PC) - Arcade - 1F (Matis Casco)
Largest map (filesize): 7,591,739 bytes - Relentless: Twinsen's Adventure (PC) - Citadel Island (Assassin)
Largest map (filesize) / smallest map (filesize) = 44,657.29 times larger
Smallest map (area): 3456 pixels - Resident Evil (PC) - Laboratory - B2 (Matis Casco)
Largest map (area): 240,000,000 pixels - EarthBound Zero (J) (NES) - World (Chiasm)
Largest map (area) / smallest map (area) = 69,444.44 times larger
Most maps for a single game: 367 maps (7.34%) - Super Mario RPG: Legend Of The Seven Stars (Super NES) (Peardian)
3510 (70.2%) wide maps
1252 (25.04%) tall maps
238 (4.76%) square maps
4698 (93.78%) .PNG maps
285 (5.7%) .JPG maps
16 (0.32%) animated .GIF maps
1 (0.02%) interactive .SWF map
1445 (28.9%) Super NES maps
894 (17.88%) NES maps
884 (17.68%) Game Boy/Game Boy Color maps
804 (16.08%) Game Boy Advance maps
420 (8.4%) PC maps
198 (3.96%) Genesis maps
67 (1.34%) PlayStation maps
58 (1.16%) Amiga maps
40 (0.8%) Arcade maps
29 (0.58%) Master System maps
25 (0.5%) GameCube maps
25 (0.5%) Nintendo 64 maps
21 (0.42%) PlayStation 2 maps
19 (0.38%) Commodore 64 maps
19 (0.38%) MSX maps
17 (0.34%) DS maps
15 (0.3%) TurboGrafx 16 maps
8 (0.16%) X68000 maps
4 (0.08%) Neo-Geo maps
2 (0.04%) Apple II maps
2 (0.04%) Atari 2600 maps
1 (0.02%) CD-i map
1 (0.02%) Dreamcast map
1 (0.02%) WonderSwan Color map
1 (0.02%) Xbox map
4941 (98.82%) maps are under 1 MB
46 (0.92%) maps are between 1 and 2 MB
7 (0.14%) maps are between 2 and 3 MB
2 (0.04%) maps are between 3 and 4 MB
1 (0.02%) map is between 4 and 5 MB - Final Fantasy V (J) (Super NES) - Worlds (Superimposed) (Dermot Mac Flannchaidh)
1 (0.02%) map is between 5 and 6 MB - Metroid II: Return Of Samus (GB) - SR388 (Zeric)
1 (0.02%) map is between 6 and 7 MB - Golden Sun: The Lost Age (GBA) - World (Stefan Mahrla)
1 (0.02%) map is between 7 and 8 MB - Relentless: Twinsen's Adventure (PC) - Citadel Island (Assassin)
931 (18.62%) maps are wide .PNG Super NES maps that are under 1 MB
1170 (23.4%) Mario maps (includes Donkey Kong (GB))
676 (13.52%) Pok?mon maps (counting Emerald Version as separate from Ruby and Sapphire Versions)
314 (6.28%) Mega Man maps (includes Battle Network, Legends, X, Xtreme, and Zero series)
143 (2.86%) Donkey Kong maps (includes Mario Vs. Donkey Kong (GBA))
142 (2.84%) Legend Of Zelda maps (includes Zelda's Adventure (CD-i) and BS Zelda (J) (Super NES))
119 (2.38%) Final Fantasy maps (includes Adventure, Legend, Mystic Quest, and Tactics series)
69 (1.38%) Castlevania maps (includes Haunted Castle (J) (MSX) and Kid Dracula (J) (NES))
All games beginning with H that have maps here are Harvest Moon games
All games beginning with K that have maps here begin with "Kid", "King", or "Kirby"
All games beginning with O that have maps here are Oddworld games, both done by Grizzly
All games beginning with X that have maps here are Xevious games, all done by KingKuros
1444 (28.88%) of maps are from games with a title beginning with the letter "S"
2 (0.04%) maps are from games with a title beginning with the letter "U"
2 (0.04%) maps are from games with a title beginning with the letter "V"
0 (0%) maps are from games with a title beginning with the letter "Q"