The first milestone thread that I ever started was for my 5000th. I swore I wasn't going to do one at 5000, but I did anyway. 100 is a nice little accomplishment, but I don't know if it's thread worthy. Do you have any idea how many threads there would be if everybody started a thread for their 100th post! 1000 might be thread worthy, 5000 is still a little iffy. 10000 is absolutely thread worthy, even pool party worthy.