Awesome update. No problems connecting to my XP Home (SP2) box, sadly my Mac's away being fixed so I can't give any info on that.
However, it's not connecting to my Netgear WGT634U NAS. The network icon appears in SMS, but SMS crashes when you try and access the share. I know it has problems with encrypted SMB authentication (had to turn that feature off in OSX before it would connect to it). Can sending encrypted password be turned off in SMS..?
EDIT: On closer inspection, when connected to my NAS (but not he XP box) the network icon in SMS flashes off and then back on again for a split-second every 3 seconds precisely. This is accompanied by some network activity according to the status lights on my router. This may be the cause of my connection problems...