There are millions of gadgets for practicing guitar. Now there is another one, the Amplug from Vox.
Basically, for $70, you plug your headphones into this device, and then plug the device into your electric guitar. You can shred like a circus freak in the silence of your own home. It comes in 3 flavors: classic rock, AC30, and metal.
Or you can place a mic in a trash pail and taking your guitar up two flights of stairs or amp a hacked Playskool toy and wake up every pre-schooler in your apartment complex again.
From the Vox site:
Plugs directly into your guitar—a great-sounding headphone guitar amp that gives you serious sound fast. Available in three styles: VOX AC30, Classic Rock, and Metal. AUX in jack lets you jam along with your CD/MP3 player. 100% analog circuit faithfully simulates the response of the original amps. AC30 emulates the AC30 top boost sound of a vintage VOX AC30. Classic Rock gives you the great high-gain sound of a UK-made 100W amp. Metal delivers the explosive roar of US high-gain metal sound. Up to 15 hours of battery lifewith the supplied AAA batteries Power supply: two AAA batteries Battery life: with alkaline batteries: approximately 20 hours, with zinc-carbon batteries: approximately 7 hours. Dimensions (W x D x H): 86 x 80 x 31 (mm), 3.39" x 3.15" x 1.22" Weight: 40g /1.41oz. (not including batteries). Included items: two AAA zinc-carbon batterieshttp://www.voxamps.co.uk/amplug/