iCal Dupe Deleter
Full user review
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"My 32,457 duplicates are finally gone!"
Pros
Publisher's description is accurate: it's straightforward. Plus it works.
Cons
I didn't find the progress bar, so was concerned when it took 10+ minutes for initial setup. Then about an hour for the following steps. But it works in background, doesn't slow things down.
Summary
I'm an idiot and still was able to delete 32K duplicates with this app!
Remember to set MobileMe to put data FROM the computer TO the mobileme calendar (MobileMe, Sync, Advanced, Reset Sync Data, flip the arrow for computer -> cloud).