I pronounce "air" and "err" (as in the verb to err) about the same. In fact, this homonym list lists them together along with "ere", "e'er", "heir", and "are" (that last being 1/100 of a hectare, not the verb.)

The normal (if there is such a thing) american english pronunciation of "user" would be roughly "youz-er"... of course, a more rigorous pronunciation guide or, better yet, a dictionary with sound files would help this discussion a lot.

-sauoq
"My two cents aren't worth a dime.";