I am using Firebug and when I refresh the page, I notice in Firebug a lot of 200 HTTP responses for js/css but am receiving 304 HTTP codes (content not modified) for all of my images. So it appears that my JS and CSS are not caching.
Also, when using YSlow to help determine the problem with my JS/CSS content not caching, it informs me that:
There are 4 components with misconfigured ETags
Listed below is my .htaccess file
# Enable ETag
FileETag MTime Size
# Set expiration header
ExpiresDefault "access plus 1 week"
# Compress some text file types
# Deactivate compression for buggy browsers
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0 no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
# Set header information for proxies
Header append Vary User-Agent