Session Tweets is an awesome idea, straight from the makers of Backupify (which service I use and recommend). They take hashtags and put them together as a collection into an emailed PDF file. So if there is a conference, session, seminar or hot trend, you can get an emailed version of the entire day.
The site homepage has the most recently created, then by date. At the bottom you can suggest some tags to have a report created. I can see this being huge during SXSWi in the coming days. Backupify is even tying this in nicely with the promo free year of the Premium service. SXSW will have a Session Tweets Daily edition coming out you can subscribe to.