I track my mileage on logyourrun.com. It is not a pretty site, but it's simple and graphs and lets you see your data in many ways. It works for me. I have tracked it here ever since my first marathon in 2009; it is probably safe to say during that training is the only other time in my life I've ran as much as I am running now.
I entered miles into my log this morning: Friday's run and our long run over the weekend. I am currently at 97 miles. :) The only other time I've ran this much was August of 2009...which was 98 miles.
I might run a little tonight (though I think I might just walk to keep my knee ok, which has been a little achy). I will definitely run tomorrow...which will put me at a nice even 100 miles for the month of July 2012.
In running universe, and especially marathon universe, that's probably not considered too many miles. But since getting miles in has always been my struggle, I feel like it's a nice accomplishment. In fact, it's a pretty big accomplishment for me. I suppose I should be proud of that.