What do we know about the two "blue" Istari?

What makes us think that Sauron was the only 'problem' in Middle-Earth that the Valar wanted to deal with? Remember there is the rest of the World (Ambar, I think) that they have to look after. Perhaps the Ithryn Luin were sent to deal with such a matter; perhaps even to combat the remaining Balrogs?

BTW - what the heck happened to the post counters?

Walter and Grond, I have become quite an expert on the Ithryn Luin and what you have said is true. And there is other reference to them. Both in UT and 'The peoples of Middle-earth'. Mormegil and I have are currently having quite the debate on this subject that we have on a little thread of our own in the Silmarillion forum. Check it out if you like. Morinehtar and Romestamo (Alatar and Pallando) did have quite an effect on the happenings of the Second and the Third Ages. Read the section on it if you'd like, I believe Grond, that you already have because you used it somewhere to win an argument and I checked up on it (in my usual fashion), it is very good!