Yep. I even have a few free 4-letter domains from it, which is rather rare nowadays for any TLD (though probably not too valuable here, especially since you can't really do "-tk" domain hacks).
What do you mean by "-tk" domain hacks?
del.icio.us was a "domain hack". He's talking about the fact it is hard to construct one with a .tk domain as there are so few English words that end with tk (if any?).
tcl.tk?
That's one of the very few exceptions. I don't think any words in English end in -tk, and few end in -t[vowel][k-sound].
Ahh, nostalgia! Remember also signing up for all those horrible free web hosting services and combining them?
Yes! First thing I thought of when I saw this submission.