A WebmasterWorld thread inquires if anyone has noticed an index update on Ask.com:
Seems to me that Ask underwent a recent update. My traffic just about doubled. Anyone else seeing anything.
A reply on the same thread says:
I'm not seeing anything – if only they would index my site, then maybe I'd get some traffic. You would think spending $5k+ per month would yield some better indexing as I'm giving them 30k keywords.
However, many users are reporting an increase in traffic from Ask.com. So Ask.com might have done an index update or even an algorithm update recently.