I've already done surface mount (soic) with both photolithography and my router. The first one I did with the router used a 30 degree V-Bit from think and tinker to make a breadboard adapter for an SOIC-8 Fram. It doesn't come in DIPs and it's real hard to plug those SOIC legs into breadboards 8)
I found the cuts too narrow with the 30 degree bit and had a very hard time not bridging to the unused copper (don't want to wipe-out, takes too long). So I switched to a 45 degree. I find that as long as I surface the table and use lots of screws around the board it lays quite flat so depth of cut is quite consistant.
I posted a couple of (blurry) pics of circuits cut in this thread
http://www.cnczone.com/forums/showthread.php?t=41190
The focus makes it look like there was uncut portions but they were actually complete. I'll have to cut something else and film it with my new camera. Its way better! Here's a sign I made a little while ago.
http://www.youtube.com/watch?v=M9fG8trDLxQ http://www.youtube.com/watch?v=xtmUbquYuuI