Before resorting to such a drastic measure (complicated by the fact that I don't have a "legit" Lion DVD, but only an untested clone), I'm going to take two steps:
one, as you suggest, restart this one (where the trouble is) with the DVD & run disk test/ repair from it;
and secondly, install DropBox & the Address Book symlink on a second Lion computer (still in the "building" stage) to see what results I get there.
As to the Ricoh issue, all evidence is that it's a driver/ architecture issue. The printer does work if set up as an IP printer, just doesn't appear in the "Default" tab on the printers list. Ricoh admits that the scan to folder system doesn't work at all on Lion (offers an ftp alternative), promises a fix. For my situation I've got an easier work-around: send the scans to my tandem Leopard computer, and I've placed the Leopard scans folder in Lion's side-bar. Works like a charm — as long as I'm running both computers.
BTW, I'm still having intermittent problems connecting in order to reply to your messages — been trying now and then for the past hour (getting "Access Denied"), finally succeeded just now.