Do you have a network-enabled scanner or multifunction printer? (I have an HP Officejet 7410 AIO.) You might find you can use the device's web interface (try http://1.2.3.4, where 1.2.3.4 is the IP address of your device) to scan documents using the Web interface. Log on with Safari app on your iPhone or iPod Touch (make sure you disable pop-ups in Settings app, as my AIO scans documents into a pop-up and common pop-up blockers do not like this).
When your image is scanned in, hold your finger on the image, and save the image. In a minute, your newly scanned photo/document will be in your camera roll until you can get your device to a computer to offload the image. Just another step closer to having an iPhone/iTouch being a complete computer replacement!
[robg adds: I haven't tested this one.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20081212111539441