[tamlin]

If you do start working in Illustrator, you may find that your productivity goes down before it goes up - although their interfaces look very similar, I found that the learning curve when switching from Photoshop to Illustrator was extremely steep. In fact, I gave up eventually and went back to Photoshop because I knew pretty much where everything was and how everything worked, and there didn't seem to be anything I would need to do in Illustrator that I couldn't do in Photoshop. Of course, it all depends very much on what work you are doing - most of my stuff is based around photomanipulation, for which Photoshop is the best tool. If your work relies heavily on vector art, then obviously Illustrator would be the way to go. Horses for courses, as they say.