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This is a known bug with the HTC Hero phone interface. Thus it affects the Droid Eris.
After a while, the name under some of the app icons will change by itself. The new name usually begins with "com."
I have a lot of apps on my Eris, and this has happened to a number of them.
This appears to be an HTC bug, not related to Android.
Someone should put up a sticky message to keep a list of known bugs.