Affiliate marketer John Engler works on a Mac (sorry John) and has listed 15 tools and services he uses frequently in his affiliate pursuits.
John’s list is foreign to me, except Jungle Disk, which I use on my PCs, but it looks like a helpful bunch of things, such as FTP, text editing, screen capture, IM, etc.
I actually sketched out a similar list of stuff I use a while back – look out for that post.
More details at http://inluminent.com/2009/05/31/fifteen-mac-applications-for-affiliates-and-affiliate-marketers/.