I must say, I'm impressed with how quickly it's all coming together ... and the fact that people are moving stable sites on other platforms over to beta xF speaks volumes for how confident people are in the product.
Just need a viable project now to commit. Mine's coming to a close at the end of this month.
Our local site under vB4.1.0 is being closed and our members are merging (well...flocking as intended) to our National Forum powered by CS2007.
I haven't had a chance to take a thorough look at beta5 but I'm sure it'll will be another fine improvement. I've noticed one feature with the style template selection I like and the feature list in the announcements is a very welcome addition to this update.