What resources exist to determine if someone is looking
into/researching you/your history on the internet?

Hi, 

I do not believe any such tools exist, the way the internet, in
general, works makes it impossible to know what others are looking for
specifically.

While some search engines might offer search trend information, this
will not be sufficent to know if you personally are be researched -
unless you are Britney Spears or something. If you have a page about
youself, then you can tell if people are looking at that, and
potentially what they are searching for to find it.

There are also many companies that provide services to provide
personal record on demand (derived from many public sources). I doubt
any of these will let you know if you are being researched through
them.

Regards,
Sycophant