ViewState Optimizer
Thanks to Colt Kwong for this link to Flesk.Uploader.
By the way have a look to their other tools. One seems to be a good idea to avoid bloated pages with viewstate.
I am talking about their component Flesk.ViewStateOptimizer
Flesk.ViewStateOptimizer is a unique technology that overrides sending ViewState object to your client's browser! This means that your client's browser will no longer receive those large hidden field values, which thus reducing downloading time. Instead, Flesk.ViewStateOptimizer saves the page's Viewstate hidden field to a file, on the server side, speeding up processing time, downloading time and data.
Combining Flesk.ViewStateOptimizer and Flesk.Accelerator, you can benefit from reducing downloading data and downloading time up to 30 times faster! No other components do the same or give the same results!
Have a look also to their other tools. Quite good job. I wondewr also if Microsoft .Net team can think about this to integrate those kind of options for Viewstate in ASP.Net 2.0.