When using a regex, I just put in the main part and leave out the .net, .com or whatever. You can also combine them into one acl...
Code:
acl msnads dstdom_regex -i icq telepk stealthsettings studentscafe stealthsettings neomessenger
Two things I do to make squid life easier.
1. I trim down the squid.conf with a backup so it's readable.
sed -i.bak '/^$/d; /^#/d' /etc/squid/squid.conf
2. I use webmin to tweak the squid settings whenever possible.