The Swivel and Many Eyes allow anyone to upload and modify data sets. It sounds great, but it all comes down to data quality in the end. If you found the same data sets in them, which one do you use (trust) ?
The data should be kept close with the authority and ideally the data are freely available to everyone online in common data format like CSV.
It would be more powerful if they could take data directly from remote sources via http.
However, holding reference of the data on their sites makes it easier for us to explore popular data or obscure data.
BTW, I did not know that TouchGraph was re-launched with consulting services. Is Data Visualization a trend of 2007?