OK -- complete newBEE here on studio lighting. I was thinking of getting the kit of two 400s wth umbrellas, etc. that the Bees offer. I use a Canon 10d now, soon a 5d. any issues with either of these cameras with regard to synching etc? Do I just use the shoe attachment on one and let the slave do the rest, or is there something Canon specific that I'm missing here?
I can vouch for the fact that the 10D works great with the ABs. The only limitation is sync speed is around 1/200 in practice (1/250 in theory) or 1/125 if using the radio remotes. No hot shoe needed, the AB sync cord plugs into the PC socket just fine.
Can't gaurantee the 5D, but they also work with D60 and 1DsMkII so I would suspect they work with 5D.
You only need to get a hot shoe attachment if using with Drebel-series.
Also if you have any questions on Alien Bees, just call or email their customer service, very friendly and they are usually happy to answer questions even some of the unusual ones I have asked.

