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Hello Everyone,

I wanted to chime in for a bit and speak about the importance of the age of text links. There has long been speculation that the age of your backlinks was important.  It wasnt until recently that most SEO’s accepted the fact that Google is starting to place extra weight on older links.

Temporal Link Analysis Discussion at SEW Forums

"Many webmasters are seeing significant drops in traffic, up to 80% in some cases within the last 24 hours. In contrast others are reporting significant rises in the SERPs which indicates a big change (which imo is not sandbox related).” Seroundtable has a question and answer
form to fill out if you have been effected. This will help to figure out a pattern perhaps. 
Seroundtable

Google Guy has stated that Google recognizes the ‘if modified since’ header & encourages webmasters to use it. Here’s the webmasterworld post by Google Guy.

Leaving it out can lead to crawling problems.

Here is a forum thread worth reading.

And here is a great tutorial on HTTP status codes.

And here is what Google’s guidelines have to say.

This is a nice study by gorank.com that merits reading. Read Article