I order this and the home & office version (notably only different in colour - this is blue the other yellow and the scent) after seeing it demonstrated at the Gadget Show 2009 and was surprised at how well it lifted some of the unpleasant gunk from a laptop keyboard.
The gel is sticky but not enough to stick to you or the object it touches, it feels slightly moist and when it makes contact with the little bits they do get stuck in the gel (and there they stay - which is the only life limiting factor I have found).
I recommend if for laptops, mobile phones, those little nooks in cars, old consumer electronics that have gathered dust (my PSP and DS both benefitted from a little clean). The scent is pleasant and the items do look noticeably cleaner after use. I have noted no staining or adverse effects on anything I have used it with.