This indoor/outdoor 5-outlet adapter ($13) is the best I’ve found for dealing with multiple wall-warts. The outlets are spaced just far enough apart to allow virtually any size wall wart to fit, and you can chain together the adapters (each outlet has five outlets, so every additional one in the chain gives you four more outlets). It’s cheaper than specialty adapters like the PowerSquid, and it’s inherently more organized. If you chain a couple PowerSquids together, you’ve got a mess of extra cords on account of that model’s ‘tentacle’ design. If you daisy chain two Yellow-Jackets together, you’ve got a tidier package.
[This is a Cool Tools Favorite from 2007]