Here is something I built with the Algolia API awhile back and just haven't gotten around to cleaning it up to post here. Doing so now since I expect to see clones of this using the new Firebase Hacker News API.
It lets you download all comments/stories for a user as a JSON or CSV file, breaks down karma between comments and stories, and plots comment/story counts, karma, etc. over time on a line chart (clicking will show you the details via an hnsearch).
Also I built some npm modules so you can get this information via the commandline.
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Also I built some npm modules so you can get this information via the commandline.
http://hnuser.herokuapp.com/.
Example: http://hnuser.herokuapp.com/user/tptacek/
The Chrome extension hasn't been updated for awhile (it just superimposes a small amount of this information on the user page).