Some random thoughts on Google (completely subjective and largely unsubstantiated):
YouTube and Gmail--So far, a home run; but barriers of entry are low
Blanketing San Fran with Wifi--waste of time; given emergence of 3g and wimax
Street view on google maps--waste of time, unless images are in HD like the ones in San Fran.
Googlefinance and googleoffice--all useless, though the spreadsheets app could gain popularity if marketed more aggressively to the younger, pre-excel generation
Googlegears--could be big, if compatible with iphone
iGoogle--questionable move. Goes against google's simplicity design and offers nothing innovative