Assessment of Electronic Government Information Products
This report was put together in early 1999, so is a little dated, but it is still an interesting look at the initital efforts towards providing digital access to documents in the Federal Depository Library Program. At the time, the study found that: there was no unified standards across government agencies, little thought had been given to permanent access to the digital materials, there are authenticity issues (census data provided by GPO Access rather than the Census Dept. website), no central web authority - even within individual agencies.

It seems like most of those concerns have since been solved (or at least addressed to some degree), but I wasn't able to find a follow-up report.