Dr. Mary Ellen Guffey: Always begin a sentence with a capital letter regardless of the arbitrary spellings of company names or products.

Shelley List: As it has in the past, capitalization is shifting. An Elizabethan sentence would be full of initial caps. Science fiction brought us the two-cap compound word, which the high-tech industry gladly picked up. Words like iMac further the development.

Karen Hanssen: I think it probably depends on how Macintosh writes it - I'd go with that.

Karen Powers: The trademarked preference of Macintosh should be respected.

Tom Kreitzberg: Any company who uses typography like this should be stiffly taxed.

Jennifer German: iMac is the brand name.

G. Miki Hayden: Lower case is correct--as is iUniverse, even at the start of a sentence.

L. L. Thrasher: Although it's a vanity spelling, I think it is more easily recognizable, much like e. e. cummings.

Yocheved Golani: More easily recognized, less prone to typos.

Bob Allen: In general I don't like fancy capitalization, but the second choice looks too much like Imax, the big-screen movie. Helping the reader understand is more important than my taste in capitalization.

Elizabeth Platt: It's a proper name of a product. You don't screw around with someone's trademark.

Elayne Cree : Haven't really come across this as an editorial issue. Usage depends on the audience.

Charlotte Fox Luttrell: Capitalize first letter of first word of a sentence.

Mark H. Bloom: It's unfortunate, but we must conform to the new structure of proper nouns.

Amy Goldyn: This is how Apple refers to them.

Carrie Garbas: I'd reluctantly have to go with the lowercase form, because it's a trademarked name.