Here's how to send someone a list of your available time slots from Outlook 2007.
Create a new email item as per below example, then click the Calendar button:
The following form will appear:
Choose the Calendar (if you have multiple) and Date (or range) you want. I usually tick the box to limit it to just work hours.
Click OK and it inserts the list of available times into your email (note it requires the email to be in HTML format).
Click Send.
Already know this tip? Yep, you're probably not alone. That's why this post is covered under the 'well duh' item in my Disclaimer.