For simple style, you can't beat the Jandd Tozi Kletter. Simple looks, burly cordura construction, attachment points, comfortable straps and well made. It has a traditional klettersack style, which means one main pocket and a top flap/pocket.
![alt text][1]
I did a review on mu my site here: http://robonza.blogspot.com/2011/01/review-jandd-tozi-kletter-backpack.html
For a combination of more business looks and more doo-dads. I have been carrying a Osprey Flapjack. It has a padded area for a laptop, dressier looks and more pockets for office life. I have been using this one for over a year and really like it.
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More photos and a detailed review here: http://robonza.blogspot.com/2010/07/review-osprey-flap-jack.html
-Joe
[1]: http://i62.photobucket.com/albums/h85/boulderjoe/IMG_3192-1.jpg
[2]: http://i62.photobucket.com/albums/h85/boulderjoe/IMG_0816.jpg