Is there a way to do something similar to a SourceSafe label in svn? I know of the bransch/tag, but I would like to have a more lightweight way of just setting a name for a
That's exactly what tags are for. See Tags on svn-book.
Though this question has been posted for quite some time and the correct answer of using tags has been presented ( repeatedly :-) I believe that the most useful answers provide not just correct information but well-rounded information: food for thought, insights on going further, etc. I wrote a lengthy article that does just that, newly published as part 6 of my TortoiseSVN and Subversion Cookbook (on Simple-Talk.com). One of the recipes (Moving a tag) even addresses the pertinent question raised by AnT in his/her answer and provides a strong argument for why you should not do it.
Here is the list of recipes in that chapter to whet your intellectual appetite:
Managing Labels
Adjusting your World View with Labels and Revisions