needless to say that i have done so myself and enjoying every moment of it.
What i did apart from that was to extract the whole ROM that was being downloaded. I have seen the Russsian ROM that was leaked but didnt want to take the risk as LG official update was on its way.
So, here i am, posting for the first time in this site which has helped me a lot with my Optimus One.
I have uploaded the Stock Gingerbread 2.3.3 Rom (.kdz format) for LG Optimus One P500 and you can download it from here and flash it onto your Optimus One if you would like to do so.
ROM details are in the following snapshot :
This ROM cannot be rooted as easily as the Froyo counterpart (i.e. with Apps like Gingerbreak, Z4Root, etc) but can be done quite easily by following this tutorial. Just make sure that you read and follow the instructions to the word.
Thanks a lot if i could be of any help.