Well, I just went and looked around the NBC site boards, and apparently the fate of Surface is up in the air right now. The next two eps will end this season, then the show will be up for review to see if it will be renewed or not for 2006-2007. Supposedly there will be some storyline "closure" at the end of this season in case the show gets cancelled, so at least there's consideration being shown to the audience in that respect.
Surface isn't the best show on TV of course, and the characterizations are still kind of weak in comparison with shows like Lost. However, the Jurassic Park-meets-The Abyss storyline is a lot of fun, and I found Surface much more entertaining than the other new "alien species" shows that premiered this season.