Various classic gaming websites

[Collector]

Nifty feature, but I am not sure what good it is to be able to search for a file you already have, unless it can look inside archives to ID where the file came from.

[MrFlibble]

For example you might want to know what magazines published a certain demo (or free full) version. If it was not downloadable off the Internet but only distributed on magazine cover CDs (e.g. for file size considerations) then this feature is really helpful.

On another note, an interesting YouTube channel:
Gaming History Source