This is an handy tip if you are having problems getting Speed Download 5 for Macintosh OS X to remember your RapidShare username/password. Within the preferences window of Speed Download 5 select Passwords and delete all current entries for rapidshare.com. Make a new entry with the following settings and hit Save.
Server: *.rapidshare.com
Path /
Type HTTP
Username: Rapidshareusername
Password: Rapidsharepassword
Next time you use Speed Download it will remember your rapidshare user credentials and begin downloading.