I've had a lot of luck with Roboform Enterprise and KeePass. Storing the passwords in a place folks can find them has never been a problem- in a protected spreadsheet, in a heavily-locked down Sharepoint site, or in an internal-only Wiki. The real hassle is changing them all when an employee leaves, which happens a lot. Roboform has been great for storing those passwords, protecting them, and keeping us from having to give plaintext access to the passwords where it isn't required.

When you have 20+ techs accessing many different systems for many different clients each day, that feature was huge.