Flyertalk! New ideas, new tips, new techniques. Any of the forums can trigger an inspiration.

General reading from novels to newspapers. One tiny example - I'd long thought of the Isle of Guernsey, but The Guernsey Literary and Potato Peel Pie Society book pushed me over.

Looking for deals. I read this one regularly. I like to search the 90-Day Ticker by "new offer", and use the Custom Search for further out things.

Looking for deals again. Hotel bidding assistance, although I find the general chatter can inspire. Also, the reviews have a perspective a bit different from trip advisor.com since they take into account the bargain rate from the bidding.