I think that there should be improvment in the URL rewriting.
For example - I'd like the website to be like this:
mysite.com/users/myusername = showuser.aspx?uid=myusername
mysite.com/blogs/myusername/1 = showblogpost.aspx?uid=myusername&bpid=1
This can be done in IIS 7.0 using the new URLrewrite 2.0 module easly, but can be just as easy be done in the app.