does anybody know could ggnetworkua
create additional links which looks like, say

http://mysite.com/users/username

which would be redirecting users (with the help of 301 permanent redirection header) to the

http://username.mysite.com  
page

Does it a good solution?
Because of from my experience I thought that 301 and 302 header are absolute evil for search crawlers.

thanks in advance