Popcheck Mail Checker is a Widget for checking how many messages you have on your POP3, Gmail, IMAP, Yahoo! and Hotmail Accounts.
Popcheck can now play a different new mail sound for each account. Each account can now also have its own, user-definable background color.
This Widget will display as many accounts as you like, and will display them horizontally or vertically according to your preference. Tooltips give you additional information as needed, and if you're using this with webmail accounts, buttons become available to allow you to connect to the corresponding website.