There's also Swivel (swivel.com), Verifiable (verifiable.com) and as mentioned earlier IBM's Many Eyes. You've always got the glowering presence of the Business Intelligence giants (SAP/Business Objects in particular) too...

And our startup (timetric.com) too, I guess, though looking at this our emphasis is very different to theirs: we do time series exclusively, which means we have a completely different set of strengths and weaknesses.

Interestinly enough, though maybe not suprisingly, some of the early adopters have been newspapers. IBM are working with the New York Times; we're UK based and have been working with the Guardian...