How about a "Republish" or "Redo" option on the publish queue items? Sometimes a transaction fails (and get fixed in the background) which require republish. Currently you have to locate the page or sg again in the tree, and then click on the publish dialog. Then reselect all the publish properties, and hit publish. It will save a lot of click if you can simply right click on the item in the publish queue and select republish.

Note: this was the most voted for idea on the former SDL Tridion Ideas site (submitted by Hendrik Tredoux); it got 32 votes there.

This functionality has been made available as an extension already:

If you think that providing this functionality Out Of The Box adds a lot of value: vote for this idea (and let us know why).