Browsing the net a Mac user should always use Safari, it really does blow Internet Explorer (windows only) out of the water. For blocking ads the best at the moment is Safari AdBlocker 1.6 and userContentcss (from floppymoose.com). However for plug-ins I recommend Firefox; and Camino is worth a look as well.
For documents there really is so much choice. You can stick with AppleWorks (a poor abandoned application) or it’s successor Pages. There’s also Mellel which if you have anything to do with academia or publishing it really does rock. As a last resort I’d use Office (viz. Word) but Microsoft’s apps are such bloatware. I regularly chose Apple’s Keynote over Powerpoint. However a real standout is NeoOffice. It’s free and much faster than anything Microsoft cranks out.
Coming back to graphics I really do hate iPhoto. It’s either the iPhoto method or nothing else? Not really, why not use Pixelamtor. It lies between Photoshop Elements and iPhoto and the interface really does kick butt.
For backups I recommend SuperDuper! Or you can incrementally fill a hard drive with Apple’s Time Machine (which wastes sooooo much space).
If you’re downloading legal material via p2p you MUST use Transmission. It’s relatively easy to use (although port forwarding can be a pain) and the footprint is really small.
If you’re editing/ripping etc. video then the following apps are recommended.
In some countries you can make a legal backup of a movie Mactheripper (from ripdifferent.com) is the Mac standard. If you want to put a dvd file onto a dvd then you can use Toast/Popcorn (which has morphed into bloatware as well); VisualHub which will also convert x264 files pretty quickly as well and burn dvds. Also you can create dvds from dvd files with DVD2OneX and DVD Remaster.
There are other alternatives but these are the best. I can’t move on without metioning Handbrake for converting into other formats although DVD Remaster does this as well. Let’s not forget that little plug-in called Flip4Mac which allows you to view WMV files in Quicktime. If you have a copy of QuicktimePro you can do some really neat conversions as well.
With all these apps this creates a lot of data and sometimes things can go wrong. To keep your OS running in top condition I recommend the following two apps. OnyX is a little utility which will clean up caches and verify the Startup Disk as well as the system structure files. For more heavy duty maintenance I use Techtool Deluxe (free if you have AppleCare support) or Techtool Deluxe which goes further than the former.
I primarily skipped the bundled software from Apple and Microsoft because you can try them out for you self (and buy if necessary). And I know there are thousands of other applications which I failed to mention but this two-part summation came in just under 1000 words. Likewise I admit to being biased, I am human and after 30 years of computing I’ve experienced some of the best and the worst in software. If you have any favourite Mac compatible applications or utilities then please let’s here your two cents’ worth.