firstly install python & scons after get the v8 source by tortoisesvn. and launch cmd goto the v8 directory type:
scons mode=release library=release
then it will build it, i use visual studio 2005, the official site said you should install the sp1 patch, but i am not, and it can still build successfully, maybe the new code is change.
then you can test the sample the site given, but it' doest build. there some errors;
for example: cannot convert Local<T> to String change it.... the final version is something like the following:
build and enjoy it!
strong recommend a good article http://www.codeproject.com/KB/library/Using_V8_Javascript_VM.aspx