Trotters Liz Pewter Calf Loafers ($85.00 - comes in many colors and widths) - the reviews on these are amazing.
Clarks Artisan Collection Dumure Flare Flat ($94.95 - comes in wide) - good for the peep toe crowd.
Softspots Posie Jewel Red Velvet Flats at Zappos ($63.99 - other colors and all widths) - again good revies.
Aravon Yvonne Flat at Nordstroms ($124.95 - comes in several widths) - I like the slight wedge/lift.
Corso Como Famenka Flat in Royal ($58.95 - comes in other colors) - don't normally recommend true ballet flats, but these get stellar reviews.
Finally - since I know some people prefer to commute in low wedges to flats - here are a few low but still stylish (at least sort of stylish) wedges that might interest you.
Anne Klein Raylene wedge in Seafoam at Zappos ($57.99 - available in other colors) - for those more adventurous in color palette. Also has surprisingly good reviews.
Rockport Nelsina Wedge Pump in tawny port (purple for Kat) ($26.44-$114.95 - other colors and widths available) - though its a higher wedge, the reviews are good and I know some prefer that height. I've always been very happy with the quality of Rockport items I've purchased.
Okay - that's all she wrote for today folks. Got a specific commuter shoe question? You know what to do (and if you don't, well click on the lick for Vicarious Shopping Questions and it should become apparent.) Hope you find something here you like!