g1smd - 10:11 pm on Jun 14, 2012 (gmt 0)
The rule target must include the protocol and domain name.
What other rules are in your htaccess file?
The four new rules should be very near the start of the file, certainly before your non-www to www redirect.
In turn, your internal rewrites for wordpress should be near the end of the file and certainly after all of the redirects.
Clear the browser cache before restesting. Additionally, use the Live HTTP Headers extension for Firefox to examine the HTTP headers.