Hi 
i never ran into this problem before because i rarely use windows in my scenes but heres my problem.
I want the window corners to be round but all of the other edges to stay sharp, unfortunately when I use the Bevel option it selects all of the meshes vertices, and subsurf creates too many polygons.
Is there any way around this?
Select the edges/verts you want to bevel, and use Scripts>Mesh>Bevel Center.
Holy darn that worked! Thanks 
This is going to be REALLY useful to me in the future, thanks a bunch.
You’re welcome.
BTW: Things are going to get even better/easier with the new mesh editing system being developed now.
Niiiiice! I really cant wait for 2.5