If you want a good bit of the functionality of Photoshop or Illustrator without shelling out several hundred dollars, check out Aviary. It’s a suite of free online tools for image editing, vector illustration, audio editing, and other stuff. Doesn’t have everything Adobe has, but for a lot of simple tasks it’s great. The online experience is slick and fits nicely into an ever growing list of web-based business apps.
The second web-business app I’m a fan of is Sliderocket. It hasn’t replaced PowerPoint for me the way Aviary has replaced Photoshop. That’s because presentations are still too dominated by the Microsoft Office collaboration workflow in my company. However for any presentations that aren’t company related, it’s my goto presentation app. At least until Google Presentation gets better. By the way has anyone else noticed how Google Docs is becoming the main online viewer for folks sharing PDFs?