Prepare your powerpoint slides as usual.  Be sure to add a few links to related pages on your website (backlinks from powerpoint presentations will display in your google webmaster tools).  And, be sure to include lots of keyword relevant text.

The most important thing to do is edit the "properties" of the file.  This will allow to give the presentation a title that will be used similar to a title tag by the search engines.

Wow.... if you can buy Keyword.com I would grab it and redirect my current site to it.  The only reason I would not do that is if my current site had enormous branding value or was much broader in products and services than that keyword.

Keyword domains rank a little easier for exact match queries and my experience says that they have a slightly better conversion rate than most other domains.

Your original question... if you buy and redirect would it help?.... Yes, the link value of the site would transfer to the page that was the target of the redirect.

If NearlyKeyword.com has a lot of links that do not duplicate the links of Keyword.com then I think that you will increase the linkauthority and domainpopularity of Keyword.com.  I would expect to see a rise in SERPs across the entire site.

I would expect the same thing to happen in the opposite direction - if Keyword.com redirects to NearlyKeyword.com...... but I would put my money on Keyword.com as the stronger site to receive the redirect.

What percentage?  I don't know.

What does a keyword.com bring to me?..... The most powerful thing.  It makes me feel like "the man" in the keyword business and gives me greater mental energy to work on the site. That is a powerful force.

Why should there be a penalty?  This often happens for important pages - they are linked to more than once because they appear in the persistent navigation and also in some on-page links.

Although a lot of people think that only the first link counts, I would consider this a sign of page importance.