I just hit the 500 mark a day or two ago, and stopped for tonight at 570.
I've been at this with a very slow snail's pace for months because my health is not in top shape, and I get very sick or fatigued a lot of nights, so I only did what I could. Spent a lot of days (sometimes, weeks) without adding a thing, but I've always kept up my reviews.
I'm glad I kept going at my own speed despite feeling guilty in the face of all the 50-A-Day Wonders here (no offense intended, I think that's awesome :P). Once my health problems eased up a little, I was able to start crawling toward 1-frame-a-day goals, then 5, then 10. I've been at a steady pace of a comfortable 15 - 30 a day rhythm for a couple of weeks now, and I'm pretty happy to finally be able to post in this topic.
I wasn't sure I'd ever get to this milestone, so the number means a lot to me. With all my reviews, and making sure to keep my failed stack cleaned up, even if I wasn't consistently adding kanji, I've gotten pretty comfortable with RtK, and the goal of over 2,000 (or even 3,000) kanji isn't nearly as threatening as it used to be, even if I lapse back into my old speed of 5 kanji a week or something. It's great knowing I can accomplish something like this even with my problems.
Onward to the half-way mark. :)