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I'M NOT BLACK!!!
Z_Sanctuary(Just because I don't have Halo 2 :P) and Immure 2.
I have a ton, but almost no one hosts them anymore, so for regularly hosted maps, I'd say siege. If you have enough people, the vehicular combat is amazing.
The Halo Maps Website http://www.halomaps.orgThe Halo Movies Website http://www.halomovies.orgThe Halo CE Chronicles http://hcec.halomaps.org
That one is easy:Halo CE (Custom Edition) Map Favorites Listhttp://hce.halomaps.org/index.cfm?pg=673 lists: Most played on Servers, Most Downloaded Files and Highest Rated Maps (by users)
Seige.