Allow me to soapbox for a moment:
@FCC has one of the best US gov comment databases. You can search across a company's filings (great for regulators, reporters, investors, competitors!) and by keyword.
Easy & transparent..for anyone out there considering comment database design
Slightly confusing to announce a shift of public comments portal 2 days before the comment deadline on a major rulemaking initiative (an April 30 deadline on prediction markets ANPRM)...
Though this announcement indicates the new portal only applies to future rules...