Getting towards the end of the season in the Alps – lifts shut in Morzine which is the end for most companies out there. I think Bikevillage run on through September and could really recommend them, went out for a week in 08 and had superb riding.
If Spain is your bag, Ciclo Montana come hugely recommended, have been out there half a dozen times and can't fault them at all – excellent riding and Marco and Jacky are brilliant guides and hosts. Should be warm but not scorchio now as well (we usually go in March/ April but if I had the time and money I'd go back next week without any hesitation).
Heard good things about Finale Ligura as well but haven't been.