However, this is interesting in their FAQ (bolding mine):

We've taken a very strong approach to security, and we've made every effort to ensure that using Wesabe is just as secure, or in some cases more secure, than using your bank's or credit card's web site. Of course we use industry-standard encryption, so none of your data or passwords are ever sent over the Internet in a form an eavesdropper could read. Unlike other sites, we do NOT ask you to enter your bank or credit card passwords into our web site. Instead, we offer a unique feature — a software program that runs on your computer and keeps your passwords safe, uploading only the data we need to help you get more for your money. Wesabe never has access to your passwords in any form. For people who want absolute control over access to their data, we provide a manual tool for uploading. Once your data is uploaded, your account is not associated with your name, email address, or similar identifiers.

KS