Why not
http://pinboard.in ? The price is low and revenue incentivises Maciej to continue to work on it, whereas you might get married, or travel, or have a day job that consumes all your time, and suddenly yabs is rotting and one day it gets hacked and you decide it's a PITA to keep maintaining it so you shut it down.
If I'm putting data into someone else's software, and it's data that I depend upon, then I pay for that system. Else, back it up regularly and prepare to move between free systems as optimism boils off.
Sorry to be a downer, but "I have written a delicious replacement" is a song that many have sung before.
