Check out this page for the highest mileage cars. You can tweet at them to get your car listed.
@TeslaMiles
Right now the highest is at 57000+.
I'm just about to break 13,000 with 300-303 on a full charge.
I have 7500 ish miles, purchased 12/04. When I brought the car home, 306 was the most I could get on a full charge. I only charged to 100% twice. I even went to the service center and they basically told me to "not worry about it, the total charge at 100% is just guidelines based on how you drive...". I was thinking "ok sure whatever" but I wanted my concern documented.
Now, however, the last time I charged to 100% I got 309 miles. I have charged to 100% 5 times total since getting the car, due to needing to do a lot of business driving those days.