Frame too short - remedies?

Glad you said that. I collated a bit of data about this. Whilst 120 seems to be the stem length of choice, there are a decent number of 130s and 140s there. In order to make it a bit more meaningful, I have included the rider's height and top tube length. Click the links for the original data and pictures.

http://www.bikeradar.com/gear/article/pro-bike-ivan-bassos-cannondale-supersix-hi-mod-prototype-20346
Stem: FSA OS-99 CSI, 130mm x -6º
Rider's height: 1.83m (6'0")
Top tube length: 575mm

http://www.bikeradar.com/gear/article/pro-bike-alberto-contadors-astana-trek-madone-16689
Stem: Bontrager Race X Lite, 120mm x -6°
Rider's height: 1.76m (5' 10") ; Weight: 62kg (136lb)
Top tube length: 539mm (effective)

http://www.bikeradar.com/news/article/pro-bike-dave-zabriskies-garmin-felt-ar-road-bike-22482
Stem: 3T ARX Team, 120mm x -6º
Rider's height: 1.82m (6ft)
Top tube length: 575mm (horizontal)

http://www.bikeradar.com/gear/article/pro-bike-george-hincapies-giant-tcr-roubaix-special-15806
Stem: PRO PLT OS Road, 130mm x -6°
Rider's height: 1.91m (6' 3") ; Weight: 74.8kg (165lb)
Top tube length: 560mm

http://www.bikeradar.com/news/article/pro-bike-andy-schlecks-csc-saxo-bank-cervlo-r3-sl--17541Frame Cervélo R3-SL
Stem 3T Arx Team, 130mm x -17°
Rider's height: 1.86kg (6' 1")
Top tube length: 565mm (horizontal)

http://www.bikeradar.com/news/article/pro-bike-lance-armstrongs-astana-trek-madone-21594
Stem: Bontrager Race XXX Lite, 120mm x -7º
Rider's height: 177 cm (5ft 10in)

http://www.bikeradar.com/news/article/pro-bike-mark-cavendishs-team-columbia-scott-addict-19867
Stem: PRO Vibe Carbon OS, 120mm x -10˚
Rider's height: 1.75m (5' 9")
Top tube length: 535mm (horizontal)

http://www.bikeradar.com/gear/article/pro-bike-floyd-landis-ouch-kuota-kredo-ultra-20424
Stem: Ritchey WCS 4-Axis, 120mm x -6º
Rider's height: 1.75m (5' 9") ; Weight: 68kg (150lb)
Top tube length: 550mm

http://www.bikeradar.com/gear/article/pro-bike-robbie-hunters-barloworld-bianchi-928-carbon-t-cube-17782
Stem:FSA OS-115, 120mm x -6°
Rider's height: 1.78m (5' 10")
Top tube length: 550mm

http://www.bikeradar.com/news/article/pro-bike-filippo-pozzatos-katusha-ridley-damocles-pi-21287
Stem: Deda Zero 100, 140mm x -6°
Rider's height: 1.83m (6ft)
Top tube length: 575mm

http://www.bikeradar.com/racing/article/pro-bike-daniele-nardellos-fuji-sl1-21355
Stem: Oval Concepts carbon 140mm
Rider's height: 1.81m (5ft11in)
Top tube length: 540mm (actual)

http://www.bikeradar.com/gear/article/pro-bike-lemond-triomphe-carbon-14679
Stem: Bontrager Race X Lite, 120mm x -7°
Rider's height: 1.83m (6' 0")
Top tube length: 565mm (horizontal)

http://www.bikeradar.com/gear/article/pro-bike-cadel-evans-ridley-helium-17288
Stem: Oval Concepts R900 RBT with carbon/titanium upgrade kit, 120mm x -17°
Rider's height: 1.74m (5' 9") ; Weight: 68kg (150lb)
Top tube length: 545mm (horizontal)