First off Belokk, a build is released everyday. That's why they are called daily CVS builds.
Secondly stuorguk, what XBMP version are you currently using that SMB isn't working? I just upgraded to build #18 yesterday; however, previously I have v2.2 point, v2.3 point, and v2.3b10 and they all worked great with SMB. You could try rolling back to a previous build to see if you can get SMB to work. If you can't get any of these to work you might have a setup issue, try getting the XBMPed program off
http://www.xboxmediaplayer.de. It's a windows based program that will generate config.xml files for you since it not working might be a config issue.
Finally LepPper, what issues are you having with the TV Guide? I previously have build #10 and just upgraded to build #18. I can't get it to work either. I followed the directions and generated the list.xml file. The TV Guide will display and I can enable/disable the real channel names; however, I don't see any programming information. When viewing the list.xml file, it appears that everything is there. Is this the issue your also having?