Google home page, Adwords, Adsense, or even ads on dp. Nothing work. Is Google Down. EDIT: Sorry, Changed ISP and everything is okay now. But that was strange.
Google will never be down! It might be a problem with your computer or your internet connection. When google will be down, people will look/try to re-think the internet. Good luck!
Maybe your ISP is having problem, google's servers are at least multiple redundant across multiple data centers and would never fail.
I had the VERY same problem about 2 days ago for many hours. ALL access to ANY google site across the world was blocked. NO ping, same for all Google NS. ALL Google SE, all adsense, displayed ON ANY site were missing .... A test to access G from US based server showed ALL fine. It appeared to some kind of BLOCKING ALL Google services by someone .... ISP or higher level. My location at that time was Philippines/Luzon ... half a day later all was perfectly working again. my totally UNqualified GUESS - hackers blocking on a higher level ( regional/national, etc ) all G IP's by inserting iptables rules ...... during same time - ALL other global services were working perfectly, incl other SE, DP etc.
no google hasn't been down recently but it had happedned in the past once, when google was down for about 5 mins.