Last October, Google released a new interface and along with that came blue triangle arrows used with the keyboard to navigate up and down the search results with your up and down arrow keys.

Reports are coming from the Google Web Search Help forums that Google may be removing this feature.
Some users began noticing the arrows have gone missing, in which Matt from Google replied:
We've removed the keyboard navigation arrow from the default search experience. But don't fear! This feature is still available by pressing "Tab" after performing a search. This change is part of the clean and simple redesign of our search results page.
Honestly, I still see the arrows and I think Google may have changed their mind and put the arrows back after these few complaints. I am not a 100% sure, but I am pretty sure Google may be keeping them and not dropping them, despite what Matt (not Cutts) said from Google.
Forum discussion at Google Web Search Help.

Comments:
Zaitbahajji
09/27/2011 12:50 pm
I can still see the arrows as well, and I like them.
Michael Martinez
09/27/2011 05:15 pm
I just absolutely hate this navigational aid. The sooner it goes away, the better.
Ajay Kumar
09/27/2011 05:17 pm
If Matt (not Cutts) says it, I might not believe it. Google should know that the easy their site is to navigate the higher ranking that Google will get in the Google SERPs....(that was a joke)
seocompany delhi
09/28/2011 06:06 am
Personally I like it too...
Sayeed
09/28/2011 11:35 am
Google maybe busted for click enkorage because no navigation below, only line line. Poeple tired anc click ad
IDS Logic
10/04/2011 10:17 am
Google has always had this restless habit of constantly changing its interface to make it seem more innovative. It may be different that users feel bitten by the inconvenience. But again, why would that bother anyone? As for now, till a new interface comes, press ‘Tab’ and get the job done.