I likly missed some but here are some of the topics ive been discussing with people recently.
1] you can use a block instead of a defensive skill roll, when doing so with evocation the strength is equal to one shift a level and you can use it an extra time per shift put into duration also for some reason called persistence.
2] when useing a block in place of a defensive roll with thumaturgy, it works as above but the base duration is scene, you use the time duration chart instead of +1 round, and the block does not go away after it is breached as per the ward/veil rules.
3] can you use a "block" instead of a non defensive roll [ie alertness for initiative, fists to attack,might to lift or break things]? My current understanding based on some of iago's older posts is yes, but there may not be a lot of RAW to support this.
4] can you use the magic system to gain a +x to a skill roll instead of a "block"? Again some of the moderators earlier posts and a few examples in the book support this however there is clearly no listed system for how you would do so in the book.
5] when using thaumaturgy at evocation speeds and methods which duration system do you use? and can you then use the evocation method to boost its duration.
6] when creating a "buff" spell is it most appropriate to use "blocks", aspects, or the temporary powers rules, or some combination of them all as appropriate?
7] When useing a shift of persistence/duration [for evocation], do the extra exchanges have to be consequtive, ie are they "gain one extra round" or " the spell can have its affect used one extra time"?
8] is there any reason why you cant/shouldn't use the thaumaturgy and evocation rules interchangeably when it seems appropriate [one example being sponsored magic]
By all means if it will ease the mind of whoever is willing to ask Mr Hicks you can place sole blame on myself, ive already exchanged metaphorical blows with him on some of the less defined parts of the rules before.
for completness sake here is the other thread i am discussing some of these in.
http://www.jimbutcheronline.com/bb/index.php/topic,23594.new.html#new