Wow--a *major* pet peeve of mine!
Some of these have been mentioned, but here goes:
Jag-wire (Jaguar)
nuc-you-ler (nuclear)
reg-ill-er (regular)
"Five cent your change." (Instead of 'cents.')
Sure-bert (sherbet--"Sure, Bert!" is what Ernie says on Sesame Street--NOT a frozen dessert!)
I was just at a concert where the performer announced, at least three times, that he was still "calm and COLLECTIVE..."
Ah-capello (a capella)
There's a shoe store 'round here that they call "DSW Shoe Warehouse." Aaaargghhhh! The 'SW' part *stands for* shoe warehouse--so, they're now calling it "Desgner Shoe Warehouse Shoe Warehouse..."

In writing:
"Please pay Frist" (first)
"Quite, please." (quiet)
"Tomato's for sale" (or anything else that doesn't own something using the posessive 's...as in, a mailbox that announces, "The Quimby's...")

I'm sure more will jump out to torment me, but that's enough for now...