Changing username on an affiliate program
 

Most progs have an encoded option or have the user number in the affiliate links instead of the username, these are fine.

Nowadays, I've been very careful when signing up for a program but at the beginning I used some usernames that don't look good in the urls and certain programs don't seem to have an encoded option.

Was wondering whether it's easy for the program to change my username or I should just sign up a second time. Seeing as I'd have to change all the links anyway, signing up a second time is ok.. I'm just thinking about people bookmarking etc.

Your old links would still work now wouldnt they if you just signed up again.

Very true, this is the simplest solution.. I'll try that ;)