An excellent free resource for maps and
map tiles for your VT adventures from
Dream Weaved Worlds.
Want your map shown here? Then email me a copy!
Head over to Dundjinni to find oodles of free maps made by the community.  
Check out the
Community Spotlight where some of the more notable
submissions can be found.  Or head over to the
Maps Forum to find maps, maps
and more maps!
Community maps made with ProFantasy Software's Campaign Cartographer
and Dungeon Designer can be found
here.

RPG Virtual Tabletop

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More community maps can be found at RPGMapShare. This site also has
numerous Tokens and Mapping Objects.
RPG Virtual Tabletop Community Maps can be found here.
A selection of Maps can be found over at The Tangled
Web.
Maps & Floorplans at the Dragonsfoot site can be found here.
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Maps made by the community members of RPTools can be found here, here and
here.
Maps by the community members of Battlegrounds can be found here.
Dungeoneering have fantasy tiles here and sci-fi tiles here, both
complete with placeable objects.
Head over to Blu's Cave to find an assortment of maps.
Upon these pages you will find a number of maps that
feature various encounter areas (dungeon rooms,
wilderness ruins, village streets, etc.) all of which have
been designed to integrate perfectly with OpenRPG.
RPG Zone

Free membership is required to access the site. Includes Maps,
Portraits, Rulesets and Tokens.
Maps at Four Ugly Monsters are available for download here.
The Palentir a Fantasy Grounds Resource Center has a gallery for community maps.
Scrying Eye Games have some freebie maps available here