Does your system seem qucker? Also , you must have done it through windows update? So now if you go into update history, does it tell you that you have installed say somthing like this? "Vista Update Service Pack 1 (KB74867386)"
Hope u Can Help
Boot up and shutdown are a wee bit quicker, as for file transfers have yet to find that out, in my update history it says this
Windows Vista Service Pack 1 (KB936330)
Installation date: 12/04/2008 09:47
Installation status: Successful
Update type: Important