But not too big and too heavy.

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That's a matter of opinion.

Macbook:

27.5x325x227 HxWxD

2.27kg

HP Mini-Note

27x255x165 HxWxD

1.27kg

I have been completely unable to find a laptop or subnotebook of any brand that will give me as long battery life as my three year 12" G4. It's disgraceful.

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Without even looking very hard...

Panasonic claims up to 9 hours:

http://www.panasonic.com/business/toughbook/business-rugged-computers.asp

Sony claims up to 8.5 hours:

http://www.sonystyle.com/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10551&storeId=10151&langId=-1&categoryId=8198552921644507782&parentCategoryId=16154

Sure, they're expensive, but (shrug).