at least the R910 and R9000 do, and with the R9000 you an get a VPN accelerator. And, neither one has any restrictions on number of users (well, you can get a 12-user limited R9000, but nobody seems to sell it), unlike their compeition (WatchGuard, Sonic). On the downside, their integrated hub is only 10BaseT.
And, of course, avoid their Cayman routers!
Tony