I was looking for a way to drop bookmarks to email threads in Mail.app‡ when I stumbled upon Hallon a VERY cool open-source project by Peter Borg (of Smultron fame), it’s exactly what I was looking for and SO MUCH MORE.
Peter does a much better job describing it than me.
Hallon can create bookmarks in many applications (like iTunes or Mail.app) that usually can’t create bookmarks and they are always accessible from a menu whatever you are doing. You can e.g. bookmark your favorite songs, an email that you have to reply to later that day, some documents that you are working on or the contact information of a friend whom you need to call before the end of the week. And you play the song, open the email, the document or the contact information just by choosing the bookmark in the Hallon menu.
IMHO most software is for the most part derivative, Hallon rings unique, filling a void that most people don’t even realize the have. The ability to jump back into an email thread, an address, a playlist, and set reminders and notes as well is great for anyone who deals with an unreasonable amount of information on a daily basis.
‡ I knew this was possible because my brief exposure to iGTD did this perfectly, iGTD was an excellent program in it’s own right, just not a great fit for me.