Not only good for tracking results and error codes but............I found there was still some hidden code on this and two other sites! 

Back when the spam bots were getting through one or more had infected the site with some code. I found some when I was doing some coding of a php file. Didn't recognize it so I submitted it to Google and it came back as base 64 language or something like that. It was written on the very top line of some php files.

Webmaster tools showed some strange results after I started tracking my sites. All had references to things that weren't on our sites. Decided to check again and found more infected files. Hopefully I got them all now? Will keep an eye on Google results. Not sure I would have found those codes had I not looked for them. They weren't in any files one might normally modify. Very sophisticated programming whoever did it. Thanks to Google I found it though.

As a side note........We've been getting hit at least 10 times a day by bots trying to register or ones I've already banned. None getting through at the moment. Someone is probably scheming up a way to get around all the new mods as I type. The perpetrator of the codes infected many many SMF sites. There were posts about it on the SMF Forum.