nemissa recently posted about an awesome site,
The Backloggery. You can create a library of your videogames and label which ones are incomplete or in various levels of completion. I've created
my own backlog page; it still needs some work, but you can see where I am on a lot of my games currently (and how shamefully few I have completed).
The cool thing is that you can embed a list of the games you're currently working on, like so:

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I'm filling this in gradually, it's a demoralising process. :(
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And it is indeed deeply, deeply demoralizing...especially looking at the fact that I've finished maybe a tenth of the games I own. I'm hoping it helps rein me in when looking at buying new games though, and it already seems to be helping motivate me to finish some of the ones I already have. :D