can I install Win7 on my Macbook?

Yeah.
Although the Official hasn't published a vision of bootcamp which can include Windows 7,but as far as I am concerned, many Mac users have successfully installed Win7 on there own Macs without any problem. So you could have a try or wait for about 3 months.

Minimum recommended specs call for:
1 GHz 32-bit or 64-bit processor
1 GB of system memory
16 GB of available disk space
Support for DirectX 9 graphics with 128 MB memory (to enable the Aero theme)
DVD-R/W Drive
Internet access (to download the Beta and get updates)"

you can install Win7 on your Macbook

yes, just following these keywords "VMware Fusion 3.0" and "Parallels Desktop 5.0". if you need a boot camp version, just following "Boot Camp on Snow Leopard".

also, you can just make an other partition base on MS-DOS(FAT) file system by DiskUtility. and reboot laptop, hold on Option until your windows7 dvd icon appe