definitely get quicksilver. get in the habit of using it and you’ll love it. for chat, use adium. it’s better than ichat and aim. it’s the OSX equivalent to trillian. there’s a bunch more stuff i have at home i’ll find the sites for you when i get home.
as for OSX discs…i still have them i think for 10.4. i’ll look when i get home from work. if i do, you can use them.