Hi, Mrrzy - no, you can't send a personal message to more than one person at a time, but I still think it's better not to use the Forum for stuff that's not of general interest. What you can do is highlight the text of your message (use the "shift" and arrow keys on your keyboard - the highlighted text changes color). Then copy [CTRL-C] the text onto the clipboard of your computer. Then start a new personal message to the second person on your list and paste [CTRL-V] the text into the second message. Copy-Paste is a technique that works both in Windows and (with just a few differences) Mac - and you can use it on the Internet and in all sorts of other applications to save you a lot of typing.
If you want to send a second person a copy of a message you've already sent, you can click on View Your Sent Messages at the bottom of your personal messages list. Just highlight and copy the old message, and paste it wherever you like.
Hope that helps.
-Joe Offer-

P.S. It's a nice idea to use personal messages to alert people to threads that might interest them. HTML works the same way in personal messages as it does in the Forum, so you can send links and use line breaks and fancy fonts and all that stuff.
You can also copy-paste a forum message you're posting and send it as a personal message. I'm going to do that with this one, and send it to you as a personal message.