Well, the files are around 100 to 200+ MB.
I'm guessing you have a new 2011 that came with 10.7 already installed? Apple is going to a diskless install now, it seems Apple thinks everyone has a high speed Internet connection. Apple does sell a Lion USB installer drive with it already set up. I don't know if that has the Boot Camp drivers on it like the disk version has tho. You should have a "Recovery Partition" (can't remember what it's called) for trouble shooting available already on it. Do a search for a way of making your own Lion installer USB thumb drive.
I think this is how your supposed to install Boot Camp on newer Macs with no disk,
I believe you have to download the Boot Camp drivers to a USB thumb drive, while in Boot Camp Assistant, and and when the installer asks for the Apple drivers you just insert it and your good to go. And I'm not sure how or if you can download the 4.0 divers separately on Apple's download area without being in BCA.
Theres a "Help" menu at the top your computer, just type in something like "Boot Camp" and it should give you more information on how to do it. You have to have an internet connection when you use it for the most information so it takes 10 or 15 seconds to show up so be patient. 10.6 doesn't have the newer information so I can't help you there.
You might do a search in these forums also while your waiting, theres a fair amount of information available.
Ok, so after reading the responce from Jaygyver I made some progress, but let me first explain my hardware and the process I used to get everything working.
1) Kingston DT101G2 32Gb Memory stick -> Product Link
2) Macbook Pro 15-inch (Early 2011) - 2.2 GHz Intel Core i7, 4 GB 1333 MHz DDR3, AMD Radeon HD 6750M with 1024 MB VRAM, Thunderbolt Firmware version 22,1
1) Mac OSX 10.7.2
2) Original Windows 7 installation disk
3) Boot Camp 4.0 (Downloaded via Mac Boot Camp Assistant)
1) Boot Mac normally
2) Insert memory stick
3) Open "Applications / Utilities" and run the "Disk Utility" application
4) Select the memory stick volume
5) On the tabs above, on the right hand side of the window, click "Erase"
6) Ensure you select from the drop down menu the MS-DOS (FAT) Format
7) Click on erase on the button in the middle of the screen. Let it do its thing and then close "Disk Utility"
8) In "Spotlight" type "Boot Camp"
9) Run the Boot Camp Assistant application
10) view the instructions on the link I provided above.
After downloading Boot Camp onto the memory stick, click install windows. As soon as you get to the window where you are prompted to select your volume to install Windows on, click on the advanced tab in the windows installation window. Select the volume and then click on Format. MAKE SURE you select the correct volume as you don't want to format your OSX volume. That sould be that then!!
PS: Jaygyver was right, if the drivers don't work in windows after the initial first boot. Open the memory car in windows explorer and run the boot camp setup. It will install EVERYTHING, absolutely EVERYTHING. I didn't need to look for any drivers online at all.
Hope this helps!