Searching my blog
More than a month back, I added a small scale search engine which indexes only my blog entries, you can access it either using search box in the page or from [search] (http://search.kushaldas.in).
It is still very initial stage of the service, the indexer is in Python and the web service is written using golang (less then 200 lines, includes few lines of html too).
I still have to work on the ranking algorithm, right now it is very generic.