I think they have potential, though it's difficult to put a price on them. Appletemplates is good because a lot of people like the overall mac look, and mac/apple templates are good for skins, websites, etc. Potential, but difficult.
I like ipowerbill.com - I think this has great potential for identity. Can't really go too wrong with a prefix of e or i if you have a decent suffix.
Pixel-gfx.com is basically not worth anything - maybe $5-20 if someone wanted to develop it, but don't count on it (hyphen).
Aspirelabs.com is worth hanging onto. It's a good name for an engineering company - as soon as someone comes along with that name, you'll make a couple hundred thousand (though the chances are slim). I would get some more opinions on this one, because I think it may have potential.