Easyjet posted a note on the website a couple of weeks ago. They're staggering the flights being put on the website for Summer 2010. April/May/June on now; July/August/September 2010 will be going on later (next month or so i guess). They used to add all Summer flights in one go, in late October/early November every year.
I booked our late April 2010 flights with Ejet from BTL to Benidorm the other week (alright, don't all laugh at once, but it's only for 3 nights and we have great fun - in fact, an absolute blast! But 3 nights there is plenty long enough!). Waiting for Sept 2010 flights so we can book our annual pilgramage to Portugal.
Looked at BTL to Corfu for next June, but they've changed the flight times out of BTL to late afternoon. Not ideal prefer early morn.
Sorry, i've rambled!!