1. How do I keep the other blogs pages from coming through to the main blog?
I think there's a setting in SWT to disable the pages. I didn't go check.
2. How or where would I put a network wide style to text wrap my pics?
Make a small plugin, toss it in mu-plugins. :) All you'll be doing is hooking in to wp_head and inserting those styles everywhere.
3. When I imported all my old posts from other sites, the HTML for my amazon.com codes disappeared...any thoughts on that?
Yep, it does that.
Oh! you wanted to know how to fix it? ;P
4. How do I get the home page on the base blog to just have excerpts
edit the theme on the main site. There's a function called the_exceprt, use it instead of the_content. this is the exact same as in single wp. it's not multsite specific.
.I'd like to add direct links to all my other sites on the home page in the pages navigation section with something like Redirectify...is there a better way?
You could add the links in a custom menu.
you could use this function in the nav area
then style it appropriately.
I'd also, if there were pie in the sky and everything was awesome, also like to have that navigation go across all the sites
Just like pie and its many wonderful flavors, there are many ways to do this. if the theme on each of the other blog was the same, it's a little easier.
If you're asking how to get the same nav bar on a whole pile of different themes? Yeah. Sky-pie time. ;P