Rising Tides - Just a really fun map to play on, really different from the maps I've seen. Not sure how balanced it is not my department (haven't played enough games on it)
Happy Time Island - easy to defend natural, really hard to defend 3rd (both 3rds are really close to each other so it's pretty action packed and open map. Walk paths are really long (Desert Oasis length imo) really fun map. I couldn't find the author on TL, so I don't have any bigger SS's of this map (search in the custom maps on US)
Geneva - This map's awesome, love the textures and everything. Really easy to defend natural, third isn't that hard to defend, but it's "out there".(kind of how the third was on inceneration zone). There's only 8 expo's on this map (two of those are gold expansions). Map distance between mains are comparable to Blistering Sands, really fun map.
Those currently are a few of my favorite melee maps that I've played during the second phase of the beta. Should check them out. What are your favorite "new" community made melee maps of phase 2?