Early 2006 iMac processor upgrade

I have an "Early 2006" Core Duo 20" iMac. I know that the processor can be upgraded (this model was socketed, unlike later iMac models).
My research on the internet concerning this comes up with info that outdated. I know that it is difficult, and I know that the chip needs to be a "mobile Core 2 Duo chip" (those that
My questions are:
1. Has anyone on this board done this?
2. What processors am I limited to, as the info I see is a couple of years old and applies to older processors? I obviously do not want to insert an incompatible chip or one that runs too hot for my logic board & fans (even though I am sure I could use SMC fan Control to help out).
3. Is the old limitation of 2gb ram limited by the 32-bit nature of the Core Duo or by the logic board... meaning if I DO upgrade to a 64-bit Core 2 Duo chip, does that change the 2GB RAM limit?
BTW, these are two of the older articles I've combed through:
http://www.maclife.com/article/createupgrade_your_imac_to_a_core_2_duoprocessor?page=0%2C0
and
http://www.xlr8yourmac.com/systems/macmini_core_2_duoswaps.html#storytop

Hi Charles
It's a little off the subject, but it would probably cost you less in the long run to sell your Core Duo and buy a New, an Apple Refurbished or Pre-Owned Core 2 Duo.
Check out > [Pre-Owned Intel Core 2 Duo iMac's|http://www.applepalace.com/apple-mac/apple-computers/imac-desktop-system s/imac-intel/index.asp]
Dennis

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