In order to solve that pesky is-it-ad0-or-ad1-or-ad2-now problem once 
and for all, I've modified the m0n0wall booting process to probe all 
devices from ad0 to ad3 until the right one (mountable and with a 
configuration file on it) is found (this of course doesn't apply to the 
CD-ROM version). The fstab is then generated on-the-fly.

I don't want to make this an official release yet, because I think it 
needs some testing. Those who are willing to try it can find it on

http://m0n0wall.cac.net/download/m0n0wall/

...look for the pb20r555 images. Make sure to test the firmware upgrade 
facility, too.

These images also have a new kernel that includes a patch for the PPTP 
VPN problems (lots of errors, packet loss). It's probably not a 100% 
solution, but it seems to greatly lower the impact of the problem. In 
any case, this is not specific to m0n0wall - it's a problem in MPD and 
netgraph's PPTP node. It's being discussed on the mpd mailing list 
(http://sourceforge.net/mailarchive/forum.php?forum_id=32902), but 
nobody seems to have a real fix for it yet.

HTH,

Manuel