Be careful being an early adopter - read the community forums for any issues with your particular hardware, as there are already a few issues (one of which would directly affect me and my hardware). I love using DD-WRT, but their QA and release quality is pretty shoddy, every release seems to have bugs...
Port problems specifically, Linksys:
DD-WRT Forum :: View topic - v24 port problems
Broadcom (Linksys, e.g.) forum with many problem reports:
DD-WRT Forum :: View Forum - Broadcom based hardware
I personally will stick to v2.3sp2 until there's a v2.4sp1 or something, I think - I've never, ever trusted a "dot oh" from this project, it's always broken in many ways. *shrug*