FWIW, I started putting together a script that will grab individual hashtag archives, or all the hashtag archives created by a single user, from Twapperkeeper (which is shutting off its archives in early January).
The script should be capable of grabbing tweets from even large archives (hundreds of thousands/millions of tweets), though it’s probably not very efficient in the way it does it…
You can find the script here: Twapperkeeper archive rescue
If you have any problems with the script, or make any improvements to it, please let me know via the comments…
OUseful.Info, the blog... 
Wow! This is exactly what I was looking for! I am very very new to computer science, I have never done anything worthwhile, I’ve just started learning, but I need some archives from TwapperKeeper, could somebody explain to me (like I am 5) step by step how to use this script? I’d be very grateful! I am on mac os x and I want to export archives for 3 hashtags. Thanks in advance!
It works perfectly now, turns out I just didn’t have a few things installed.
Don’t works for me. Any fix?
Twapperkeeper archives will probably have been shut down by now…
Other working alternatives? Thanks
What do you mean? Other Twitter archivers? There’s a personal version of Twapperkeeper (myTwapperkeeper?), ThinkUpApp, or Martin Hawksey’s TAGSExplorer Google Spreadsheet Twitter archiver.