I thought it would be interesting to put together a list of "must have" software for affiliates. I'll get the list started
1. Macromedia Studio8 - Web Design Suite which includes the following:
___Dreamweaver - Web Page Design
___Flash Professional8 - Flash Authoring tool for flash web sites and flash adds
___Fireworks8 - Vector & Bitmap Editing, Graphics optimization
___Contribute3 - Integrated content management solution
___FlashPaper2 - Similar to Adobe PDF's universal file format
2. Photoshop CS2 - Photo & Image Editing
3. Banner Maker Pro - For making Gif banners
4. SWF Text - Flash banners made easy
5. Privoxy - For anonymouse surffing, works like a dream
6. AllWebMenus - For easy menu solutions
Edit: I will update the list as users add their recommendations.