I just found a nice tool for browsing samba shares.
fusesmb
http://hannibal.lr-s.tudelft.nl/~vincent/fusesmb/
it is a userspace filesystem driver for smb shares. It's not in portage, but all it's dependencies are and its really easy and quick to install.
You can use you favorite filebrowser after the install to browse smb shares.
I haven't tested excessively, but it seems to be really nice and quick.
Only problem is that it's early in development (pw protected shares are a problem at the moment)