The really great advantage of using the new QB Premier Edition 2006 beta is the ease of use / organization. There probably isn't too much in the sense of improvements to other areas, or atleast I haven't noticed yet.
For anyone who is new to QB I would really highly recommend to wait until the new edition arrives later this quarter. Its just so much easier to use from the starting screen, and look historical data up concerning customers while on the phone.
There have been other changes, the units of measure feature may not be available, however there are simpler work arounds for it.
But anyone who is borderline and can't decide, definetely wait for th 2006, it will be easier to use.