Quote Originally Posted by M. A. C. Newsome
...There are two main branches of Celtic languages, Q-Celtic and P-Celtic. Unless I have the reversed in my head (which is very well possible!), the Q-Celtic branch consists of the Gaelic languages spoken in Scotland and Ireland, and the Isle of Man. P-Celtic would consist of Welsh, Breton, Cornish, and more than likely the lost language of the Picts..
No reversal there, spot on. "Q" celtic has a "harder" edge to the pronounciation, whereas "P" celtic languages are a bit softer on the consonants.

Just for some clarification too, Scots Gaelic & Irish Gaelic have their differences. I studied some Irish 2 summers ago and the teacher, (a native Dubliner) was unfamiliar w/ some common Scots Gaelic phrases. However, her fiance (a Newry native, if I remember correctly) was able to get the main ideas w/o knowing the exact translation.