for a specific number of Intel unlocked....u get some umm....extra "Easter eggs stuff" ex: unlocked 5 Intel u can play in black and white (just an example not true lol) Check on ign.com for a guide on them :)
if you go to the main menu and go to where you can pick your mission and go into intel, you can find secret stuff about different missions.
an achievement
Intel is Computers In Campaign that you Collect To Unlock CHEATS.
you get a trophy
http://www.supercheats.com/guides/call-of-duty-4/Intel-locations.shtml This website will explain where all the enemy Intel units are in the Call of Duty 4 campaign.
2000
Intel is an item you will find in every level their are three in each level. once you find one it will erase the highlighter in the Intel page for that mission for a website that tells you where all the Intel is [is] located in the related links below.
No. It has no point award system.
The call of duty world at war is not a prequel to call of duty black opst.
60
call of duty black ops
I think you can get them by finding some hidden enemy intel, at least that's how it works in Call of Duty 4: Modern Warfare.
You can get the enemy Intel in campaign. Where there will be hidden and you will have to search for them.