If you use Michaels HomeSeer .Net plugin then I recommend you update to his just released 2.3.0.2 version which eradicates an issue reported by a couple of users where the xAP conduit goes deaf or exhibits an increasing delay in processing xAP messages. It can be downloaded here. If you use his other 'hybrid' xAP HS plugin then I don't think you need to update.

http://board.homeseer.com/showthread.php?t=119121

Michael also has a prolific range of xAP applications available here:

http://www.mcssprinklers.com
http://www.mcssprinklers.com/xapXap.htm

... plus his latest offering - for the new Meccano Spyke camera robot - just in time for Xmas

http://board.homeseer.com/showthread.php?t=137411
http://www.spykeeworld.com/spykee/UK/index.html

Cheers Kevin