If you are not getting update notification maybe it's because it's not available yet for your device manufacturer' country. It happened to me with my X10, I had to debrand it.
Try XDA forums, it's the ultimate Android Development forum, lots of tweaks, guides and custom ROMs.
I recommend it or every Android user :)
http://forum.xda-developers.com/forumdisplay.php?f=945
Plus you won't find of course Applanet on the market, it's illegal, and its server is currently offline.
Try to search some forums i'll pm you one if you want.