Help!!

I've got a football game on Saturday and it's suppose to be rainy and dark and cloudy all day!!! This is a really important game!! It's the last one of the season and we're giving awards afterwords... And I don't want my pictures to be completely to dark!! Anyone got that one great setting for a rainy day football game?? Any suggestions would be great!!! Thanks!!!!

My general approach to sports in moderately good light such as a heavy overcast: Wide open 70-200/2.8 and high enough ISO to get shutter speed faster than 1/500 for the action. Meter the grass in M mode for about +1/3 stop.

I looked at your previous football shots and I think you could benefit by making a few changes in general. I see many, many shots at ISO1600, 1/1000 and f/11. This can be changed as follows:
1. For starters, you should be shooting sports wide open. Your selection of f/9 - f/11 for many shots is why you have distracting backgrounds that are in focus in most shots. You really don't want those parked cars and such behind the game to be in focus. After all....why spend over $1000 for a f/2.8 zoom lens and then shoot it stopped down to where your EF 70-300 would be just as good?
2. Once you open up the lens, you would have had plently of light and you could have reduced the ISO. Shooting at f/2.8 is four full stops better than where you shot a lot of the football pictures. I would have shot the sunny games at ISO200 and the overcast one at ISO400-800.
3. Metering was inconsistent. When you are shooting outdoor sports in good light it is often a good idea to put the camera in M mode and meter off of a neutral tone like grass. I can and will use Av mode when it's best, but if the light is constant M allows me to meter for the athelete and not allow background tones to change the exposure.

Thank you for the advice Jeffery... I'm still working really hard to get the best out of my gear and haven't quit got everything down pat yet...... So shoot at a f/2.8 and at 200ISO? And use AV mode when the light isn't constant?

Here is how I would approach any day game if I were you. I'll use Av mode if you are more comfortable with that.

Metering Evaluative or Average
ISO400
Aperture f/2.8 to f/3.5 (wide open if you are very happy with that with your lens)
Then focus on a football player (warming up or in the early minutes of the game)
Check the shutter speed. If it is 1/2000 or better drop to ISO200. If it is below 1/500 then go up to ISO800. In between and I would stick with that.

Try shooting the game like that, keep an eye on the histogram to avoid clipping highlights and keep an eye on the shutter speed if the sun comes out or if it starts getting dark etc. etc.

Use servo focus and be aware that your DOF will be very shallow so you must focus precisely.