My favorite annuals --
Petunias -- especially the small petunias like Picobella and Fantasy that don't need as much maintenance; also Super Cascade
Marigolds -- I love Sunset Giants and Sugar & Spice
Impatiens -- I've had great success with Accent series and Blitz impatiens
Coleus -- Wizard mix is my hand's down favorite at the moment
Less specific -- other favorites include
Morning glory
Hollyhock
Thunbergia (better at climbing than trailing)
Snapdragon
Nasturtium