Someone over at AndroidForums posted this little tibit. I am not 100% sure, however it did seem to work for me. Those still waiting for the OTA...
Go into settings ->Date&Time -> Uncheck Automatic -> Select "Set date" and put your date out a few weeks ahead(i used 19th Sept).
Go back to main menu and wait, it will at soem point go back to the correct date.
I went into Settings -> About ->System Update and Bam!!!! It was downloading it. And yes before i did this I check beforehand to see if I had the update, which I did not.
There has a been a couple people this sems to have worked for. I make no claims that this works 100%, however it certainly triggered mine to get the update..
Enjoy Froyo if it works for you!!!
This worked for me. Thank you.