Competitive research and traffic analysis is an important part of launching a new site or web app.
I did a quick study that uses source code search sites as the subject for comparison. Here I highlight some key metrics from these two Firefox add-ons:
I found these sites through my delicious bookmarks, search, and the "Similar Pages" and "Related Links" features of both of the above add-ons
|Source Code Search Site||Alexa Traffic Rank||CoolGoogle PageRanke|
First, you have to take these rankings with a grain of salt. Google's PageRank seems to honor the difference between google.com (10) and google.com/codesearch (7). Alexa's Traffic Rank (2) does not honor the difference and uses the ranking for Google's main domain instead.
Another useful metric is unique visitors seen here from compete.com: http://siteanalytics.compete.com/koders.com+krugle.com+codease.com/?metric=uv
For a quick look at how the search results look for these sites, I plugged in Spring's verbosely named AbstractTransactionalDataSourceSpringContextTests. Here are some links to the results:
If you'd like to mention more sites like this, please share in the comments!