1) If you ever want to be able to run other powerpoint decks from within an open powerpoint deck there is a way. Ideal for hosting numerous speakers' decks and with the added flexibility of being able to amend the running order if needed. You can amend the size of each first slide so that you can have multiple decks on one slide too. I may create a screencast of what to do but in the meantime it's all here.
2) Very excited by this. When presenting you can run a live, navigable web page from your slide. Download LiveWeb (free), follow these instructions and the option will appear within the "insert" tab. Joyous.