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It is just two different package type. Like previously, the Core 2 Duo, Core 2 Quad, etc. were from the LGA775 package type.
Some boards can support LGA1366, others can support LGA1156.
Intel® Core™ i7 Processors exist in both LGA1366 and LGA1156.
Intel® Core™ i7 Processor Extreme Edition exists only in LGA1366
Intel® Core™ i5 Processors exist only in LGA1156.
Intel® Core™ i3 Desktop Processor exist only in LGA1156.
Here are the list of the Intel (R) Desktop boards and their respective package that they support.
All the best,
Thank you Rajiv
The most simple way to describe them, is that the 1366 socket has triple memory channel while the 1156 socket has dual memory channel. The CPU's which plug into those sockets have similar core architecture but the 1366 pin CPU version is higher performance overall.