Just to update my post above.
KGet released with KDE 4.4 SC can automatically download public keys (default
setting) if they are not present and thus reduce the user interaction needed
when verifying a Signature. Signature-checking and checksum-checking is done
automatically by default and the user is only informed if one of these failed
and in the later case offered with the option to repair or redownload if there
is no repair information.
The assistant to create Metalinks can output Metalinks version 3.0 2nd ed [1]
and also metalinks from the most recent draft (mentioned as 4.0 with .meta4
ending). That means that I hope that the spec is finished before the KDE 4.4
SC release. :)
Additionally what I forgot to mention above is that the assistant can create
metalinks based on different metalinks, so you could convert 3.0 2nd ed
metalinks to 4.0 draft or simply remove some mirrors, add some checksums etc.
Adding partial checksums can only be added automatically i.e. if you selected
files on your hd, adding signatures is not supported yet, though existing
signatures (if you based it on another metalink) won't get removed.
I know, this is hardly brief anymore :D though just take the features you
think are noteworthy in connection with metalink.
[1] The output only has support for features where the draft and 3.0 2nd ed
match, i.e. where a corresponding feature exists, so no mime, or related
settings.