Doesn't look like we've ever covered a pencil on Engadget before, but this is just too nifty to pass up: the Sharpie Liquid Pencil uses liquid graphite to write like a pen, erase like a pencil, and eventually dry like a permanent marker. Sharpie's blog says the Liquid Pencil go on sale in September, but Office Depot has a $5 two-pack with six erasers in stock online now -- and we were charming enough to snag an early review sample.It basically works as described, although the marks don't erase completely clear -- because you're writing with a metal pen tip, there's no way to avoid impressing the paper a little, and the indentations are pretty visible. Still, it's better than any erasable pen we've ever used, and it definitely writes like a decent clicky-pen, so we can't fault it too much. Oddly, Sharpie's blog says it takes three days for the ink to dry to permanence, but the back of the package says 24 hours, so we'll have to see how long our test scribbles last -- we'll let you know. Video after the break.