Justin Lancy has a slew of useful scripts for taking those bazillion Safari or Chrome tabs you have open and tossing them into your app of choice. I’ve been using the Safari to OmniFocus script for a few years now — it’s great for the times when I want to clean up or call it quits for the day, yet I still have several (mostly unrelated) tabs open in Safari.
Related: I save a Pinboard tab set (using the Pinboard Safari extension) when I have a list of tabs that are related (such as when I’m doing research on a particular subject).