I've been amassing a collection of scripts to basically do the same thing over the last couple of months, just running them all once a month with cron.

None of the services I've been backing up (Goodreads, Trakt, DeviantArt, Tumblr) are currently covered by Timeliner, but the extra twist of assembling all your data into a single timeline sounds kinda cool, so maybe it's worth contributing a few data sources.