Does anyone know where I can find part-time, telecommuting freelance copywriting jobs?

You could check this out http://w2c.info

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This may not be PRECISELY the type of portfolio-building you have in mind.... but there are many websites out there that will commission writers to provide content (articles) to give the search engines something to target. Here is an article written for website owners who are considering hiring writers. It might get some creative juices flowing...

Check craigslist.com

Hello...yeah, i like writer but really i dont know how to write..hehe!neway, im a mechanical engineering student and im doing online part timejob that is free to join.. mail me ok if u'r interested.. i can lead you! nothin to lose becoz its totally free.. its kinda easy job actually..but waterver u do, please do not join watever job that ask you to pay before you start to work! they should be paying you!! good luck!