We are on the move!

We are moving house soon, so it's time to downsize our possessions. Today we went to a Give & Take event, a regular occurrence in East London. It's a simple concept: you take your unwanted possessions and browse the offerings.
Unfortunately, although we left our stuff, we came away with other stuff, so it wasn't a successful decluttering experience.
I usually give stuff away through Freecycle and local charity shops, but there is the odd item I try to sell, usually expensive things I really don't want to part from. However, I find selling a bore so I am always open to alternatives, such as swap forums. Any good one?