I do some web design and maintain a couple of web sites, but I do more photography than anything else. I'm retired and not sure I can afford to upgrade from CS4. Would it be smarter to just upgrade Photoshop and not Dreamweaver, etc,?
Only you can answer that question. What features do you absolutely need that are only availbale in CS5?
What do you currently own?
If you own a suite, you have no choice but to upgrade to a CS5 suite.
You cannot upgrade from a suite to standalone products within the suite. e.g. from Creative Suite 4 Design Premium to just Dreamweaver CS5 etc.
Upgrade paths are:
Standalone to standalone
Standalone to Suite
Suite to Suite
If you have standalone versions of DW and Photoshop then take the CS5 Trials for a spin when they're available and make your assessment based on your workflow and what features you need.
Thanks. I have the suite, so you have answered my question