@stillmotion has a great set of suggestions:

SMAPP – 5 Killer Canon Lenses

Here they are:

  • Canon 24-105mm f/4L IS USM
  • Canon Super Wide Angle EF 14mm f/2.8L II USM
  • Canon Telephoto EF 135mm f/2.0L USM Autofocus Lens
  • Canon 1.4x EF Extender II
  • Canon 100-400mm f/4.5-5.6L IS USM

MattsMacintosh has a good intro

  • Canon EF 50mm f/1.8 II
  • Canon 50mm f/1.4 USM
  • Sigma 30mm f/1.4 EX DC HSM
  • Canon EF 24-70mm f/2.8L II USM
  • Sigma 10-20mm f/4-5.6 EX DC HSM
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