How many research points do you get by lightbulbing?
How many hammers do you get from having a Great Engineer rush a wonder?
Tough ones - those questions should merit bonus points.

I looked around a bit but was unfortunately unable to find the GE hurry production figures. I know I had seen a table of them here a while back, so hopefully someone can come along and help out with that one soon. FWIW, I know it is actually based on the size of the city you rush in (which was not what I had expected), and I just got 800 shields when rushing the Pentagon in a size-fifteen city in the CivIVor OT game. Also, here's the info from the GE section in the XML, if you can make anything out from it (seems to imply a 500-shield floor):
<iBaseDiscover>1000</iBaseDiscover>
<iDiscoverMultiplier>2</iDiscoverMultiplier>
<iBaseHurry>500</iBaseHurry>
<iHurryMultiplier>20</iHurryMultiplier>
(Oh and also, I'm pretty sure lightbulbing gets better as your population (and possibly landmass as well) improves, so it can be best to wait until a turn before they could complete a tech by lightbulbing to use them, so that you can get a few extra beakers out of them from concurrent city growth, IIRC.)
bardolph, another minor GP-related domination tip - if you are really close to domination, and spawn an otherwise-useless GA (because aren't they all?

), typically from the National Epic's tainting of your GPP pool, a good way to get some use out of him or her is to create a great work in a centrally located city you have just taken over (e.g. an AI capital) when you are just a few percentage points from the landmass requirement for domination. Rather than having to wait out mutliple resisting cities and possibly even border expansions in them, you get a giant culture bomb instantly and win the game that many turns sooner, netting a higher score in turn, FWIW.