301 redirects that I don't want > result of Multisite & .htaccess changes?

I’ve noticed some 301 redirects in place that I haven’t *explicitly* setup.

i.e.
http://wedo.net.nz/gallery/ redirects to http://wedo.net.nz/photobooth/gallery/
http://wedo.net.nz/pricing redirects to http://wedo.net.nz/photography/pricing/
http://wedo.net.nz/kat redirects to http://wedo.net.nz/blog/2011/03/katrina-ant-sneak-preview/

And more.

I think I actually know why this is happening – there’s a pattern here, and some sort of generic redirect going on where *some* of the URL is being matched. I don’t understand my .htaccess and mod_rewrite well enough to understand where/how/why, but the problem is – I don’t want this happening.

Here’s my .htaccess, courtesy of a MultiSite installation very recently:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule . index.php [L]

What can I do to avoid the redirects above???