"unknown error" when syncing apps

I can download from the App Store (most of the time, at least), but every time I download to iTunes and then try to sync to the iPhone, I get an error like this:
The application "XYZ" was not installed on the iPhone "(iPhone name)" because an unknown error occurred (-4).
Anyone seen this, or (better yet) know what to do about it?

I have this same problem with 6 of my apps now. A month or so ago (before the update?) a second sync would clear this up. Now i get it every time I try. Something is definitely broken here.
A workaround that may worked is to deselect the apps giving you the error (from the Applications tab in iTunes), sync, then re-check them and sync again. This has worked for me in the past.
I do hope Apple fixes this annoyance though.

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