Be careful when using DHCP with the slug.
I almost bricked mine because this was not working.
So i went back in assigning static IPs and DNSs to my slug.
FYI I use a WRT54G router with HyperWRT Thibor, and its workign like a charm.
I believe I read somewhere on the nslu2-linux wiki that there is a flaw in the dhcp-client in R63/Unslung that causes hickups.