Adium
- combined IM, speak to people on Yahoo, MSN, etc (better than iChat IMO)
NeoOffice
- a free MS Office substitute - open, edit and save .doc, .xls etc files.
Depending on what you get (or rather, how you get it
), you might find this one's essential...
Little Snitch
Loads of things I can't remember at the moment (recently lost my bookmarks
) but check out what's posted here...
http://macspecialist.org/content/art...ssential_apps/
http://www.coolmacapps.com/
Will try and post more as and when I remember.