Imogen Heap's first solo album is I Megaphone. It looks like it was out of print for a while, but now you can get it for a reasonable price on Amazon, so maybe her new popularity cause the CD to get a re-release.
I had a bootleg copy of it for a while, and it was good.
I have Speak For Yourself and the Frou Frou album, both of which I like quite a bit.
I kid. It's been ages since I've heard it. If I recall correctly, it's not that different from Frou Frou or her second solo CD. You know, just along that same vein.
Someone who's listened to it more recently could correct me, though.