This week at Lifehacker: Set up your personal wikipedia. Help that feeble brain of yours and develop digital photographic memory. Remedy your memory-sucking Firefox installation. Make Mom a rotating digital photo frame that refreshes with your current Flickr photos. Finally, rig up a portable USB charger with a 9-volt battery.

You gave up Britannica for the Wikipedia a long time ago. But have you ever wished you could have your very own editable encyclopedia to build a reference to the vast swathes of knowledge you absorb every day? Check out our guide to installing the free MediaWiki on your PC and endure us invent the term "personalpedia" all at once.

Disk space is cheap and plentiful, and so are digital cameras. Use the tagging and organizing capability at photo-sharing site Flickr to keep track of your stuff. Archive digital images of business cards, wine labels, meals you've cooked, gadget serial numbers and more. Here's how to turn Flickr into your digital photographic memory.

We loves us some Firefox but the little bugger can get a little greedy with the RAM from time to time. When the memory-usage-o-meter's going through the roof thanks to the 'fox, reduce it using magic! And, um, about:config.

Mother's Day approacheth. What are you giving the woman who dealt with the shock treatment that was your childhood? Beam photos right to Mom's mantle real-time with a DIY rotating photo frame powered by a beater wifi-enabled laptop and your "formom" Flickr tag. What a good kid you are.

Finally, charge your iPod, PDA or any other USB devices on the go with a DIY USB charger made with a 9 volt battery and some basic circuitry. Package the whole thing up in an Altoids tin and you'll be rockin' out off the grid.

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