After seeing this exemplified in the life of Jim Elliot I began using a 'page a day' diary about 6 years ago to keep a diary of day by day thoughts, happenings, quotes, teachings & experiences with Christ. But over the years I have begun using it more like a journal & neglecting the date heading, so if I need 6 days worth of pages for notes on one sermon I use them.
-----------------
So here's a basic example from my notes on Tim Keller's 'Adoring Christ: Communion with God'. These were some of my notes taken from this message (6 pages were used in all), but I think they give a small indication of Keller's teaching on meditation.
(I think if you click the image you'll get it larger)


Alot of the time, unless i'm writing a quote, it will be more of whats been said & how it relates to me, rather than word for word - this is after all my 'journal' of sorts on what Christ is bringing to my attention for rebuking me, admonishing me, encouraging me & teaching me etc...
However if it is an expository sermon it will take on a 'Bible Reference' - 'Explanation of the text' look that is much easier to follow than my normal scribbles, looking more like a dictionary than anything else.
Usually there's a few different coloured pens on the go, its usually very basic & can be messy.
----------------
If you take notes as you listen to sermons at church or on mp3 etc, or as you read books it would be great if you posted, on your blog (leaving a link in the comments here), examples & what you find works best for you. I'm sure I (& others) could learn from you how to deepen our efforts at this, & so deepen our knowledge of Christ through His word.