Last week, a WebmasterWorld thread posted January 9th in the morning and a Google Groups thread posted January 10th, reported the Google Remove your URL form to be down.
It wasn't until last night did we get confirmation from Google that the tool was indeed down.
Adam Lasnik replied to the Google Groups thread saying;
We had a short amount of downtime with the tool, but it should be working now.
I suspect it was down for only about one day and not much longer.
Softplus's suggestion in the Google Groups thread to move the tool into Webmaster Central, I think is a nice idea.
Forum discussion at WebmasterWorld & Google Groups.