You can also steep the leaves with your regular teabags to get a lemon tea when making iced tea. You can also chop it and use it in food that you want a slight lemon tang to use similar to mints. It also makes a pretty aromatic garnish! There are medicinal uses for it but I can't remember what they are at this time-seems like it was good for colds or cramps or maybe it has antiviral properties...my books are all upstairs still in boxes or I could look it up! Here is a link that has some recipes and a ton of information about lemon balm you might like to read! I grab a leaf when i get a bug bite, wet it with my tongue and stick it to the bite. I use lots of lemon balm because the bugs just love me!
Mostly I just love to walk by and smell it!
http://www.theepicentre.com/Spices/lemonbalm.html