Would syncing my iphone for the first time erase my data?

I have never synced it to an itunes since getting my iphone(4) earlier this year, i'm wondering if i sync it to a freshly installed itunes on a laptop will it erase all my data? (apps, contacts, etc.)
Also i have my music in a music downloader app. So is this risky?

Nowadays I believe the phone/iTouch is linked to a specific iTunes library, so if the iTunes library that you used to sync with your iPhone is different than the one you're trying to sync with now, it will prompt you and ask if you want to erase all your current iPhone data and re-sync it with the new.

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