[Update: Check out a much-improved version of this script submitted by Larry of ScriptingForLawyers.com.]
I've modified existing NetNewsWire to del.icio.us Applescripts to save the currently-selected news item to del.icio.us with the tag "toread". You can easily change this tag to whatever tag you use to mark items you wish to read later on.
delay 0.5), but you can adjust this if it wasn't enough time.
To adjust the tags that are sent to del.icio.us, edit the line containing
"&tags=toread " & (subject of selectedHeadline). You can set multiple preset tags by separating them with spaces. For instance, to add tags "readlater" and "for:user1234", change this line to
"&tags=readlater for:user1234 " & (subject of selectedHeadline). If you don't want the subject(s) of the new item to be added to the tags, simply remove
& (subject of selectedHeadline).
I personally run this script using a Trigger in QuickSilver.