If you are planning to come to New York City this weekend for PodCamp NYC and are following the The UNOFFICIAL Guide to PodCamp NYC and you want to take the subways or buses to get around (hey, they are a bargain at $2.00 and are relatively safe), there are two websites you should check out:

MTA.info
For those coming from out-of-town who want to take the New York City subways or buses, check their website since the weekend often has significant service changes:
http://www.mta.info/nyct/service/advisory.htm

HopStop
If you are not sure which train or bus to take, try the great directions and travel time estimates at this website: http://www.hopstop.com/?city=newyork

Though I live here, I find myself using these as well for weekend travel, especially when the trains run on different lines and make express stops on the local tracks!