Suggestions to alleviate malware suspicions

I posted this in the OSX discussion section as well.
I was web-surfing the other night on my typical (standard, supposedly safe) websites.  I attempted to change the format of the screen when a dialog box opened asking me to confirm the change.  This has never happened before when performing this action, but in a moment of brain freeze, I hit "allow" without even thinking about it.  As soon as I hit it, I freaked, of course.  Then I read a comment that said this page was linked to a corrupt site.  Excellent.
I was running firefox with no-script enabled, and was using a non-admin account.  I am a very paranoid person when it comes to malware and gernally bad stuff out there, so I took the following actions to try to ensure nothing could possibly be affecting my system:
I erased all cache, cookies, etc. from firefox.
I ran a search for all files created or modified that day - nothing.
I rebooted the computer and did the command-r routine, got into disk utilty and erased the HD and reformatted it (extended, journaled).
I then re-installed Lion from the online Apple support server.
Next I plan to restore my last time machine backup to get everything back where it was.
I am pretty sure that when erasing and reformatting the HD, some sections of the disk are actually not erased - e.g., after erasing the computer still knew to automatically connected to my wifi.  So with that said, are there any other procedures I should take to ensure nothing is on my system that could be bad?  I know how macs are supposed to be less vulnerable to bad things and unix is supposed to be pretty bullet-proof, but I like to be as thorough as possible.
Thanks for any suggestions you have, or even if your advice is "you went way overboard", that is appreciated.

Firefox often falsely marks sites as "untrusted".
You have absolutely nothing to sorry about, you just clicked on a typical spam ad.

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