Before I switched to my Mac I used a custom button in Picasa to publish pictures to my Gallery 2 site. Installing this on a Mac is little bit more complex…

This is what I did (please read it first, before you try it yourself):

• read the thread about this custom button
• noticed that the Mac version of Picasa is not mentioned at all
• downloading the first zip file and storing it in ~/Library/Application Support/Google/Picasa3/buttons does not work (as a folder, zipped, zipped and renamed to pbz did not work)
• installed the install file in the post from aquanox24 (2008-08-27 08:48): picasa://importbutton/?url=http://efehn.de/files/efehn_de.pbz
• this will install a button that publishes pictures to efehn.de
• Go to the folder: ~/Library/Application Support/Google/Picasa3/buttons
• rename efehn_de.pbz to yoursitename.pbz.zip
• double click the zip file to extract the contents
• open the folder yoursitename.pbz
• open the .pbf file in a text editor
• change all the references to efehn.de into the correct site name
• change the url param into the correct URL. This is a very important step!
• save the file
• remove the original .pbz.zip file
• right click the folder and select Compress “foldername“
• rename the .pbz.zip file to .pbz
• start Picasa
• Voila! your custom uploading button is finished.

Please check all the prerequisites on the site (see the forum thread for relevant links).