Ok thanks that's good to know, I didn't even know how to do that so there's some knowledge. Any more tips?
well - quite possibly the best tip i have ever been given, was from our very own TikTekTak. Even a decent 600dpi scan can struggle to give clear text, and his tip was as follows:
"I mostly use the unsharp mask tool in photoshop with the settings
Amount: 60%
Radius: 1,4 pixels
Threshold: 1
You can find the tool under filter -> sharpen -> unsharp mask
You just have to be carefull because if you apply this filter more than two or max. three times it can make the legal text a bit edgy and pictures often tend to show every flaw/dust/speckle when sharpened with the filter.... Some pictures(I suppose it depends on the scanner) don't tolerate the filter at all unfortunately and can look pretty bad when sharpened with the unsharp mask...."
I have played around with other sharpening tools, and even the smart sharpen in CS5, but the above settings give the best consistant results. Just remember not to apply it too the whole document, as it will create grainy effects - just highlight the text portion within a layer and apply once or twice and check the results.