Don't have PowerPoint or Keynote? Don't despair! The following is a list of websites etc that will help you prepare a great presentation - all in the cloud.

Google Presentation - easiest if you have a Google account. Just open Google Docs and under create choose presentation. If you are used to powerpoint you will find it does not have the same types of page layouts and options but it will get the job done.

Prezi -
You really have to see it to understand. Prezi is a cloud-based presentation maker that is zoomable.
It takes a little while to figure out but there are really good tutorial videos. If you are tired of the same old powerpoint presentation, this is for you!

MyBrainshark -
Screen_shot_2011-09-05_at_8.42.35_AM.png This website allows you to create and share a pretty slick presentation. You do have to sign up for a free account but after that, you are good to go.

Keynote - not cloud based and only accessible if you have a Mac but it is the easiest and creates the nicest looking presentations.