Thanks, Zero. Tried, didn't help.
Caved in and went online with Verizon support, spent 2 hours doing things like resetting router, etc. I figured the stuff wasn't going to work, since I could access the internet, just not fleaflicker, and it was on multiple computers (and an iPod), but I humored them.
Afterwards, I tried resetting my DNS servers manually, that didn't help.
I went to the library, and could get to fleaflicker that way.
Today, I loaded UltraSurf, a proxy server, and I can get to fleaflicker. Not sure what's happened to cause me to need a proxy, but I suspect Verizon has blocked fleaflickers ip, or vice versa.
I have a trouble ticket in to Verizon and will see what they say, but in the meantime I have a workaround.