I'm pretty tempted by BrowserLab and Content-Aware Fill, but like Simon I only really use Photoshop in earnest out of all the CS5 apps.
Simon, can you "crossgrade" from the whole CS3 to just Photoshop CS5, for a cheaper upgrade price?
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Matt Doyle, Elated
Second Edition of my jQuery Mobile book out now! Learn to build mobile web apps. Free sample chapter: http://store.elated.com/