Originally Posted By: Phoenix42
This all assumes that they are Picasa users themselves. Snail mail and grabbing them from where ever they post their photo are tasks you may need to consider.

Well, I'm not sure how/if you can let others upload to your albums, but even if you use Google's web albums, you don't necessarily need Picasa to upload photos. It has the usual "browse for photos" upload method as well.
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Matt