The Blekko robot's UA has changed. It still includes the word scoutjet but now includes blekkobot and a new robot URL.
Mozilla/5.0 (compatible; Blekkobot; ScoutJet; +http://blekko.com/about/blekkobot)
The robots.txt keyword is now blekkobot but it will still honour scoutjet so no need to change.
Unusually for a bot page, blekko's has always given the IP ranges the bot uses. Probably worth a visit from time to time for updates. Current IP ranges are:
184.108.40.206 - 220.127.116.11
18.104.22.168 - 22.214.171.124
126.96.36.199 - 188.8.131.52