Collectably Saves Open Tabs into Neat Visual Boards
Chrome: There are a ton of ways to organize your overflowing tabs
In essence, it's a visual bookmarking tool where you can drag-and-drop links and share your collected tabs with others. My favorite feature is the sub-boards, because it offers an additional layer of organization. For example, I'm gathering links to write about this week in a "To Do" board and organizing them in sub-boards titled "Tuesday", "Wednesday", etc. Like the links, sub-boards can be dragged to be reordered and you can also customize the background color for each.
Collectably is currently in open beta, so it's still rough around the edges (search doesn't seem to work and it would be nice to be able to tag links). Still, it's a great alternative to bookmarking all your tabs if you're a visual person.