Considering Linux

[Dyne]

So I decided to try out a Live CD version of Ubuntu Linux and I actually quite like it. Now, I've never seen anything wrong with Windows, but I have some questions about switching:

-Can I use Photoshop on Linux somehow? I have Photoshop 7, but is there a converter I can run? I'd sorely miss it, and GIMP isn't quite good enough.
-Likewise, is there a good Windows Messenger 7 build that can run on Linux? The all-in-one program was kind of lame.
-What about Media. I have a lot of music and I use Windows Media Player every night to listen to music. Is there a good linux alternative?
-I do a lot of programming. Is Java any good on Linux?
-How would I upload something to an FTP in linux.
-What about fonts. If I went to download from dafont.com, am I not able to? Or can linux use the windows fonts?

Also, is there things I can do on Windows but not Linux?

Thanks guys.