I started to import all of my photos into Picasa but then wanted to rearrange how they were organised and needed to delete all of my albums that had been created (some 200+ folders). The only way to do this normally is to go into each album, drop down the menu, select delete and confirm the deletion. This was going to take a long time! I searched about and found that this can be done using the Google CL tool.
Download the CL Tool from Google: Google CL Tool
Extract the zip file to a suitable location
Open up the command prompt
Navigate to where the CL tool was downloaded to
Run 'google.exe' to display the cl promt '>'
Run the following command (this will delete any albums starting with these characters):
picasa delete --title a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t|u|v|w|x|y|z|A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z|0|1|2|3|4|5|6|7|8|9
Enter your email address for picasa, this will open up a browser window to enable you to auth with google. Login using your email address / password.
If Google tries to get you to login using a Google Apps for Domains account, then manually type in the link shown in the command prompt into your browser, excluding everything after (and including) the '&hc=' towards the end of the link
You can setup cl tool to not prompt for deleting an album by altering the config file found in 'C:\Users\yourusername\.googlecl\'