These are the software that I use most often under Mac OS X.
For videos, nothing beats VLC (or VideoLAN Client). It plays all the common video formats and is constantly being improved by a dedicated team of developers.
I use iPhoto for managing my photo library. I find the integration with the rest of the iLife suite flawless, and particular enjoy the ease of resizing and e-mailing photos directly from the application.
This is a no-brainer; iTunes is the best music player on the market.
For PHP development, I find that Vim suits all my needs.
I find Terminal to be more than enough for the tasks that I perform most often on the command line.
Mail and Internet
Mail.app is the best e-mail client, simply because it has an excellent spam filter.
For USENET, I use MT-Newswatcher. It appears to be no longer in active development; however, it suits all my needs.
For surfing, I used to like Safari a lot, but recently I have started visiting sites that are not fully supported by it. So, I am gradually switching to Firefox.
For IRC, X-Chat Aqua is the client to use. It is just as excellent as the original X-Chat.
For instant messaging, I use Adium. The duck theme is cute and the team releases frequent updates.
I think that is about all I have on my iBook at the moment. As anyone can see, very little is required for a pleasant experience with Mac OS X. Most of the tools listed are free or cost very little.
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