Wine & CrossOver
I think the work that the Wine team is great, for those folks who are interested in moving to Linux but do have one or two apps which they need which do work under Wine, they could possibly get rid of Windows.
Sure there is the argument that rather than use Windows apps on Linux we should be developing Linux equivalents but not everyone who uses Linux is a developer, I'm certainly not.
I also think that the issue with things like Photoshop CS5 is that it's an expensive app and a lot of Open Source developers do this development in their spare time and quite possibly some of them might not have access to Photoshop etc. I think this is where things like Codeweavers come in with their CrossOver programs (which don't just benefit Linux users but also Mac users too). CrossOver can afford the apps like Photoshop which developers can then get working in Wine and CrossOver and then release the fixes back to the Wine community.
I'd say having used the new version of Wine for a couple of days, it's working pretty well (it allows me to use LogMeIn on the Windows build Firefox as it crashes on Ubuntu 64-Bit in both Firefox and Chrome). I also like the new icons too.