illutic - that's what I've been trying to explain this whole time.
B - don't use two themes. you can't use two themes for one blog. you CAN put whatever you like in the home.php file, which is in a THEME folder. Any theme folder. As in, the THEME for your main blog.
Edit:
So it looks like this -
wp-content
- themes
- main blog theme
home.php (has whatever you like for the main landing page)
index.php
style.css
and any other theme files that were there.
WP and WPMU will always always always use the home.php file first if there is one present. but it has to be in a theme folder.
by "static" in this case, we mean one that is not changing much on a regular basis. Technically the About page is static too, but I'm splitting hairs and getting off topic.