Take a look at this link posted by Jameel at the Muqata.
The Muqata: Don't know who to vote for?
It only takes a few minutes, there is a wizard that asks you a series of questions on your opinions on various Israeli policies and then compares your answers to the platforms of each of the parties running in the election.
I found the process very interesting, although I still don't know who to vote for... (have 19 days to decide...)
BTW - I couldn't get it to work on FireFox and had to open it in Internet Explorer.