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just to play around with some pics
^ The Gimp.
Pixlr.com
Edit or develop? Windows or Mac?
Darktable for OSX is very good for developing. Not sure if there's a Win version.
Paint.net is a doddle to use.
CS2 is free now I think
tried cs2 but needed a reg number ...?
Pixelmator?
I manage most I want in picasa
Depends what you want to do.
Simple stuff - Pixlr / Picasa / Google+ editor
Slightly more complex stuff - Paint.net
Pretty much everything except CMYK - GIMP
Each has an appropriate learning curve (although if you know Photoshop then none will be that tricky).
Each has a learning curve except for GIMP which has a learning cliff!!
Pretty powerful once you have the hang of it though.
The cs2 download page has the registration number.
Just download it again and make sure you copy and paste the number.
Paint .Net, one of the first things I install on any Windows machine. Great application, easy enough to use and covers 95% of what I need.