The title says it all.
I'll post some I've found in hopes that some of you have used them and the best will be voted up.

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You should make this community wiki if you're gonna post 5 answers yourself. – Ciaran Aug 25 '09 at 23:22
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now that's a cute approach: post possible answers to your own question and let the others vote for the best one :) – Molly7244 Aug 25 '09 at 23:23
@Ciaran Good point. Done. @Molly Do you see a problem with that approach? I'm hoping people post others I haven't found already as well. – GollyJer Aug 25 '09 at 23:25
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not at all ... +1 – Molly7244 Aug 25 '09 at 23:31
Have asked about this on meta.stackoverflow.com/questions/17555 - just wondering what other people think as I've never seen something like this before. Thanks for making it CW anyway – Ciaran Aug 26 '09 at 0:07
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10 Answers

Google Calendar

Used this for ages, it even has the Google Calendar Data API for implementation on any site that’s free and has CalDAV support to help you sync events between Google Calendar and Apple iCal or Mozilla Sunbird.

I use it everyday, it's very easy!

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Flexvite *beta

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