Certain easyJet routes for next Winter are already on sale, 4 months earlier than last year.
Geneva flights from Manchester, Newcastle and East Midlands are on sale up to 28 Feb 2010 now.
(no reason to panic unnecessarily though – Sat 13 Feb 2009 flights already over £100 single).
BA of course are on sale 364 days in advance, plenty of Gatwick – Geneva available for £70 return.