[tobyhede]

It definitely early for a big leap if you have solid Flash skills and existing content. If you don't have massive investment in existing tech, then new development should definitely be done in HTML 5.

However, Canvas is years behind Flash in terms of ease of development. At the moment using Canvas is a completely manual process. You have to manually manage every single element, there are no events, no layers, no objects - you roll all of this yourself. That said, looks like longer-term Adobe will be targeting Canvas.

I am currently building a game using SVG via the RaphaelJS library. Overcomes a lot of the problems with canvas (I get events and a real-life DOM), and my use-case is not performance intensive so seems to be working fine so far.

Cheating is a problem in all games, Flash is arguably a little harder to cheat, but it is still not particularly difficult. The best thing to do is setup server-side controls for cheating - there are a range of different options that can be pursued her.