It's been a lot of fun because I get to play with ElasticSearch and responsive JS UIs. Still a long way to go before it is really useful - particularly categorical browsing and parametric serach.
I've also writing a weekly "In the Trenches" journal about the project: http://euphonious-intuition.com/category/comparerc/
2. Automated transactions export from my bank(s)
(adding YNAB support at the moment)
https://www.strongcoin.com - Bitcoin e-wallet.
https://www.bitcoinary.com - Bitcoin market place.
http://servermonitoringhq.com - Server monitoring.
http://steamxl.com - Chrome extension, coming along slowly, but haven't spent too much time on it. Still learned a lot from it.
This has basically been my playground for cool things - geolocation, facebook actions, rich snippets and more.
37 side projects, many of which are from Hacker News.
http://www.social-permissions.com - Unified way to manage the privacy and permssion settings of social sites!
It was quite interesting to learn how to develop plugins for Firefox, Chrome & Safari using HTML & JS
http://www.nowiam.at - HTML5 Based Location Sharing
A proof of concept how good the HTML5 geolocation feature works among different browsers