How Often..?

Do you change the title on your page?

rarely ever

Unless I'm doing a sitewide change to a script that causes titles to have gotten changed, I never change the titles.

Once they're up there, I see no reason you'd need to change them.

I using title in the following format:
[MAIN TITLE] - [SUB TITLE]

MAIN TITLE is constant while SUB TITLE changes once a month

Some circumstances:

1/ If I feel a different title can give me better positioning.
2/ If I have a special offer and want to push that, especially around the holidays...like "Free Shipping".
3/ If the titles from other companies in the serps are beginning to look to much like mine, I will change it up to stand out more.

thanks for the responses everyone