Recipes!
Redirecting MSIE users to a different site
RewriteEngine On
# Match documents
RewriteCond $1 \.(s?html?¦php[1-9]?)$
# Don't match indexes
RewriteCond $1 !/?index\.(s?html?¦php[1-9]?)$
# Match an IP
RewriteCond %{REMOTE_ADDR} ^123\.123\.123\.123$
# Match a browser
RewriteCond %{HTTP_USER_AGENT} !^Mozilla/[0-9.]+\ \([^)]+\)\ Gecko/20[0-9]{6}\ Firefox/[0-9.]+
# Redirect!
RewriteRule (.*) http://www.example.com/ [R=301,L] 