Assuming that you just nailed your presentation, and allowed your crowd of potential clients and now it's time to wrap up your presentation - you have a couple of choices to make depending on the opportunities you wish to have access to.
1. Thank You's and Appreciation
A very common choice by most professional presenters, is simply to close up with a thank you and some appreciation for those who've helped you research, put together and present your presentation. If you go this route, make sure that you think your audience for being such wonderful listener's for your presentation because you couldn't have done it with them and then make sure you invite them to check out any books, CDs or other promotional merchandise that you may have brought with you.
2. Q & A
A much more effective method, used mostly by more competent presenters, and one that I highly suggest you consider - is to offer your audience the opportunity to ask questions of you, we can display your expertise for your answers. This method of engagement is often much more effective, than saying, " thank you, please buy my stuff."
Though being that each presenter is different, you might just be more effective at using the same key message than answering questions spontaneously.
3. Free Gifts
Alternatively, you can stand out from either of the common presenters, by doing something just a little bit different. Now, the free gift group may not be your schtick, however it is still an idea to consider. After all, it worked well for Oprah, who was inspired by other inspirational presenters. For this method, although you have to do it, is to prepare some form of free gift that you can give away to all or some of your audience when you're done speaking. This method often goes over well, and is a fantastic rapport builder.
*And don't discount the option of using all of these methods. Regardless, you'll want to thank your audience, though there is nothing wrong with offering question times where your audience can sample your expertise, as well as a free gift for your audience members.
Be creative and do what feels most natural to you, as that is what will best connect you with the audience members you were specifically trying to target.