I have had the 28-13mm and 50mm f/1.8 lenses- bought them new when I purchased my first DSLR camera (several years ago, when the choice of lenses was much less than it is today). I have since sold both these lenses (and more) - while upgrading to better glass. While I had a decent copy of the 28-135mm - it's been superceded by the better Canon 15-85mm. Both copies of the 50mm f/1.8 I've owned weren't sharp enough wide open - and the focus and bokeh were not up to my standards.
Like has been suggested above, if I was in your shoes I would definitely keep the 10-22mm - as it's the only ultra wide angle (UWA) lens you have. But if you've determined that you haven't used it in the past 2.5 years... then I'm curious why you bought it in the first place.... I have the Sigma 10-20mm, and use it often - it really shines on my 7D for UWA shots - very sharp corner to corner. However yes, some people don't use UWA so much - and yes - I do a lot of landscape photography where UWA can be handy at times.
The previous 2 weekends I have been away and used my 7D with 15-85mm and 70-300mm L. This is such a great travel combination, top quality glass - very suited for the Australian outdoors where we get a lot of great light.
When I want fast glass, I want and use primes. I'm still looking forward to Canon announcing (and selling) a new, improved 50mm prime - at least f/2 - sharp, contrasty with good bokeh wide open, solid, fast accurate autofocus (USM or STM) - and hopefully IS too.