Grouping of feeds will get dramatically better in a couple of weeks.
In the mean time, you can now view a Microsoft only home page at: http://weblogs.asp.net/default.aspx?GroupID=2 and subscribe to a Microsoft only feed at: http://weblogs.asp.net/mainfeed.aspx?GroupID=2
In addition, if you want to skip Microsoft bloggers, you can view and subscribe here as well: http://weblogs.asp.net/default.aspx?GroupID=4 and http://weblogs.asp.net/mainfeed.aspx?GroupID=4
The original links (no groupID's) will continue to display everyone who blogs here.
Also, speaking of sydications, although category feeds always worked, I do not think most people knew they existed, so I tweaked the url and made them display right next to the category. For example, updates to this site can be viewed via: http://weblogs.asp.net/sitenews/category/1813.aspx/rss .
Also again, all of the individual feeds should now have a valid atom feed. Ex: http://weblogs.asp.net/sitenews/atom.aspx