Sebastian got himself a shiny new Mac Mini and appears to like it. I promised him to enumerate the programs I most use, so here goes.

• Firefox (why?) with some add-ons of course
• NetNews Wire: the best feed reader
• ImageWell for taking screen shots, cropping the odd picture, and saving/uploading them
• Fink

Apart from those, the built-in programs I most use are

• Mail.app
• iSync
• iCal
• Addressbook
• iPhoto with Flickr export and iPhotoToGallery

If you are looking for a nice list of Open Source for Mac OS X, look no more. Update: And check out FreshMeat.