I've done some research on VSL #3 and it looks like the bees knees (cats pyjamas). I'm really excited about trying it. After googling around there seems to be a very high level of satisfaction. Backed up by good research.
450 billion live lactic acid bacteria in every packet. Many people take a couple packets a day, which is close to a trillion bacteria! It has a high success rate in trials of IBS and ulcerative colitis. Lots of positive anecdotal reports for candida too.
I can't wait to try it. It is pretty expensive though. I also ordered some Culturelle which I think I will take at the same time. Nowhere near the numbers of live bacteria, but Lactobaccilus GG has proven to be a particularly good probiotic in trials.