It's tricky to get email notifications right so that they're not too spammy. Maybe later.

For now, I added this page where you can see your IP logs for the past 30 days: https://bitcointalk.org/myips.php . You could pretty easily write a userscript to periodically check this and warn you if it's weird. (But don't scrape it on every pageload.)

I don't want to make older IP logs automatically accessible because that'd give a hacker a bunch of useful/sensitive information. But 30 days is probably not too harmful.