When searching for a particular image that had appeared in XKCD to show a friend, I wondered if there was an index of all the XKCD comics, and all their associated meta-data (Title, URL, Image URL for hot-linking, Description, and the hover-text). There wasn’t. So I created one.
Update: the google spreadsheet is automatically updated by a perl script using Net::Google::Spreadsheets, which is called by cron. My script originally parsed HTML pages, until I realised that XKCD has a JSON interface.
Update 2 (2015-03-24): This has been replaced by a a simple table