Magento Community - Getting Rid of Downloadable Products from the customer log in pages
The best way to get rid of Frontend links is to use and extension. I'm not normally one for using extensions but I tried this one (which is free!!) and it seemed to do the trick, also has nice little other pieces such as the home button, beats doing url rewrites.
Anyway. Log in on your magento account and look for http://www.magentocommerce.com/magento-connect/frontend-links-manager.html download this remembering to back up just in case. Then go into your admin panel there will be a section on the left hand side reading MAGEPSYCHO EXTENSIONS
if you look under this there is a title that reads Frontend Links Manager, (if you click this and it comes up with 404 errors, don't panic, just log in and out and try again, all should then be fine. Anyway in this you will see the option just go through and see what you want enabled or disabled then save config.