Personaly I plan on blocking...
And Kurasks (once I get my sword.)
Does anyone have any better sugestions for what tasks to block?
Warped Terrorbirds are top of my list to erase. Scabarites aren't bad if you use the small peninsula outside (the desert at the far northeast of the swamp); there are no mages there to really mess you up.
Kurasks are worth another look, as they drop broad arrow heads and unfinished broad bolts, plus lesser amounts of the finished arrows and bolts, as well as the occasional super strength potion. Also, they now drop noted pineapple as well as unnoted, and their new rare drop is a leaf-bladed sword, which I imagine is a much faster melee weapon which can be used with a shield. I had a kurask task last night and got 4 rune longswords and 2 addy kiteshields, plus lots of the broad arrow/bolt stuff.
Turoths, don't know if/how their drops have changed but I imagine it is similar. I am waiting for a turoth assignment to go kill the boss and check out the multi area in the desert slayer dungeon.
My blacklist will be based on difficulty of monster versus drop list, where difficulty includes things like how long it takes to get to them, and how easy it is to kill many in a row. Jungle horrors are therefore high on my list, as it takes too much running around to kill lots of them, and their drops are pathetic. Mutated zygomites were on my list for similar, but I realized they are assigned by Chaeldar, and I don't mind a short task by Zanaris in Zanaris. Kalphites are obnoxious, even though they are cannonable, so I might rid myself of them once and for all. And possibly Suqahs, since I don't like going to Lunar Isle for slaying something with no drops worth mentioning.
Currently using Chaeldar for my 11-19 tasks (hoping for Lesser Demons to go solo Kril); back to Duradel on the 10s. Blue Dragons -- great task, but difficult to avoid the crowds.