I think you will find these useful.
http://www.steamgifts.com/bundle-games
http://www.sgtools.info/
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You cannot trade the gift for 30 days, you can give it in this time, so you can make a GA straight away ;)
For your second question - http://www.steamgifts.com/about/faq :>
Generally if game is on this list: http://www.steamgifts.com/bundle-games it will only give 15% of it's Steam Value. Game can get added to the list not only if it's in bundle but also if it's avaiable very cheap (below 95% off usually) in any of steam regions conpared to US price (so if 20$ non-sale-price game cost 0.9$ during sale in russia for example it will get bundled).
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Other than that the promotion/sale on Steam does not affect the Value you receive. Only thing that affects it is if game changes it's base price later on - then your Value changes as well as it's calculated based on prices in Store - if price changes your Value will change as well.
Now for some examples ;)
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You should still be able to send it as a gift directly through Steam or email.
Steam restricts all gifts from being used in a Steam trade for 30 days after their original purchase date. However, you can still use the ‘Send A Gift’ feature to send this game to a friend at any time.
And here is the list of bundled games which give 15% of their value as CV.
Isthereanydeal.com is good for checking bundled games as well.
Unbundled games give 100% of their value as CV.
More about all of that in the FAQ
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Also is there like a site where I can see how every game is calculated?I mean if I get a game during a promotion from steam how it will be counted as a bundle for less contribution?
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