I was just thinking about this today myself... I reached my 127 goal at the end of August, continued to lose down to 120. I managed to maintain 120 for about two weeks, then today weighed 117. In looking back I'm not sure I maintained those two weeks- there were unusual circumstances during both weeks. I am also in a size 4 - every pair I've put on this week has been loose.
I have added 100 calories per week pretty much every week - there were three weeks with vacation in there where I blew calories out of the water, a couple of other weeks where I didn't add calories because I knew I had exercised a lot less. I also got sick recently and was out of exercise for most of two weeks.
The weeks I came closest to maintaining I was averaging 1850 per day and exercising about 30 minutes a day on average, five days per week. I'm going to add more calories in next week, want to try 1900 with a consistent exercise schedule and see what happens.
There have been a couple of other threads about this recently, I'll look for those and edit if I find them.
Edit:
http://www.3fatchicks.com/forum/showthread.php?t=156194
http://www.3fatchicks.com/forum/showthread.php?t=152501