So, I used to use the Google sitesearch feature for my website for a bit before I moved over to the WordPress search engine, and I think that it is a useful feature of Google to not only specifically search your own site add-free, but to search other sites quickly. Google have released the custom search engine software, but it isn't easy to quickly search a site normally with.
So, if I wanted to specifically search a site like aelabs.net, I could just search Google normally for the terms I wanted, then add in the "&sitesearch=aelabs.net" into the URL. Sound too complicated? Well, you could also search Google with "site:aelabs.net IP", which would also yield the same results.
This is useful not only for searching websites that do not have a built in search engine but for also obtaining more accurate results in some cases.