goodroi - 4:44 pm on Nov 16, 2010 (gmt 0)
technically this is cloaking but it generally falls into the category of allowable cloaking. google understands that there are some situations where it makes for a better user experience and will not always ban a website that is using cloaking aka ip delivery.
here are some other tricky situation were webmasters may use cloaking:
-international website redirecting a french speaking visitor from their english domain to their french domain
-flash website showing an html version to help google index their content.
since this can be abused (and is abused) google is not very forthcoming about how they separate the innocent well intentioned cloaking from the spammy cloaking. google tries their best but sometimes they flag well intentioned sites and allow spam site.