Hey guys!
I just switched to Mac (I have a late '09 Pro). I'm looking for software that would allow me to tag terms in an itemized list:

i.e. I want to create a library of articles from the Economist. An item in the list entitled 'The pound is losing weight, Feb. 6th, 2010' would get tagged with 'British Economy' and 'Pound.'

The idea is that I can then later get a list of all articles with a certain tag.

If anyone has any ideas as to how I could do this, I'd really appreciate it!