you can do it without the software, it is really easy. Just make a contact in your address book, make the name the message you want to send someone, such as ".Hello you have been bluejacked" (the . is just to make sure that it will stay at the top of their contact list, makes it easier for them to delete them afterwards, bluejackers play nice).
Then highlight that contact and hit the menu softkey and go to "send via bluetooth" look at the list of phones that show up (obviously there has to be a phone in range with BT turned on) choose one and send it. Then look around all covert like and see who gets it. Then you can send them another one about the shirt they are wearing.
You can even snap a pic of them and send it to them via bluetooth the same way, just snap a pic, then MOVE TO SOMEWHERE ELSE IN THE ROOM, then send it, that way they can't look at the pic to find out where you took it from, you won't be there anymore.
lots of fun to be had, the software just makes it easier.
EDIT: check out
www.bluejackQ.com for more info. (site has nothing to do with Motorola Q's the name is more like "bluejack-you")