Where there any recent changes in Googles algorithms?

About a month ago one of my sites was receiving a little bit of Google traffic. Not a lot but about 30-100 hits a day. Then one day my site just disappeared from Google altogether. My listing on the first page was always between the first and fourth listing. Once that happened I couldn't even find my site in Google unless I searched the site via "site:mysitehere.com".
Then last week my site reappeared in Google. (I've made no changes to the site) I started getting Google visitors again. My…
Where there any recent changes in Googles algorithms?

See original post by Az Tek