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P and S,
I'm not exactly sure what you mean by high resolution pictures – but I'm guessing that you want to send a picture via email without resizing it.
If you sent one picture at a time, you can tell Picasa to send the photo in it's original resolution. Check on Tools Options Email and check that 'Size for Single Pictures' is set to 'Original Size' Then, just email one photo per email.
The other option would be to upload your pictures to a web album and select 'Size to Upload' as Original Size. Then you can share the uploaded album with your friends and they will have access to your original-sized pictures.
Let us know if that helps