Like the last guy said... 2.0's coming, so probably not. However, custom maps will begin appearing a while in (and hopefully some Nancy clone that's not, you know, buggy!), in which case just keep your eyes open. Server pages tend to host them for download (easier to put the load on a webserver).
If you want a pretty good map, Download ns_europa. It could be an official map it is good, link is on the YO Clans site (yoclan.com) <a href='http://www.yoclan.com/downloads/nsmaps/ns_europa.zip' target='_blank'>Click here to Download</a>. To install it extract everything to yuor Sierra\halflife\ns directory (if that is your directory!).
Most decent servers will have map downloads on their website for all custom maps used on the server. Your best bet would be to find a few servers you like playing on and then check to see what custom maps, if any, they play.
Comments
EDIT: Just checked, it is.