A guy named RRaveen has setup a .net community portal named CodeGain and located on http://www.codegain.com.
Yet the portal is still in process but the content which he has posted is really useful and in fact it really help me in some places.
The best part about this portal is, it is not .net or asp.net specific. You will find articles on desktop applications, Java, Oracle etc.
Previously, RRaveen had also written some articles on HighOnCoding.com and is active .net community so he is on a great task.