ok need to clear some things up here I think
WUs are worth exactly the same whether they are in Beta or in public release, the only time this is incorrect is if the project ends up going a lot quicker or slower after a few generations and the points get adjusted accordingly before being released to the public - generally though the points stay the same.
If something goes wrong with a WU in Beta and it ends in an EUE then we receive the same points as if the WU was in public release and EUE'd - it's proportional to how long has been spent on the WU and if anything tends to end up a bit lower than what you should have got.
Beta WUs are currently giving good points as the majority seem to be large Double Gromacs which fly on an SSE2 capable machine - however there are also Gromacs WUs being tested which I'm only getting about 100ppd (lower than the benchmark average of about 110ppd), I could get much better points from the p1164 and p1165 WUs which have just gone public in the last week or so (infact I have had better ppd from the 56 pointers on my SocketA rigs
)
Once the bugs are ironed out of the Double Gromacs WUs they will be out on public release anyway with a lot less chance of EUEs than there are currently (I'm getting about 1 in 5 failing with EUEs currently - not due to the machine, they have not completed on any other machines they were released to)
Like joeyjojo said the way to get Beta WUs is to join the beta team at the folding community forums - however they've got a lot more selective recently so make yourself useful and appear interested on the forums over there and be prepared for a bit of a wait while they decide if you're in it for just the points or will make a useful addition to the team.
Saying that though a quick look through the
general projects summary page shows there are plenty of sweet WUs in pulic release anyway - looks like the drought of decent public WUs may be coming to an end