I've been wanting to have the ability to ssh into my Win 7 home machine from my laptop, from anywhere and I'm not sure how to do this. Can someone give me some advice or point me to an article that could show me how to do this? Also, would this affect the security of my home machine (sometimes I do banking there)? 

The home machine has windows 7 Home X64 bit OS under a Linksys router. The laptop is running Ubuntu Lucid.

Thanks!