The easiest way is to look at Settings > About Phone > Software information if the information matches that of the OTA or LV3 then that is what you have. You can find that information in the 2.1 sticky at the top of the forum. If what you have does not match then you can flash LV3 to your phone and be up-to-date. If you already have it, flashing again won't hurt anything though.
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