I'm using MAMP and I can't get mod_rewrites to work.
After lots of playing with numerous http.conf files and then finally looked at my php_info, there is no mod_rewrite exstension installed.
I opened up the php.ini files in Applications > MAMP > conf > php5.2 & php5.3 and looked at the exstensions and there was no mod_rewrite.so. All I can see is:
extension=imap.so
extension=yaz.so
extension=mcrypt.so
extension=gettext.so
extension=pgsql.so
extension=pdo_pgsql.so
extension=pdo_mysql.so
I added it expecting a stroke of luck - but no joy!