I live in the mountains of Vermont where there are few flat rides so since I can't avoid them I seek them out. I now do the climbs I used to avoid and they get easier. Also got some great advice on climbing from some other threads in this forum such as (and in this thread as well)...
-Stay seated and shift your weight back -- this allows you to extend the big muscles in your legs (as mentioned in the previous post as well)
-Get out of the saddle occasionally to mix it up
Also, don't be ashamed of your triple -- use it. I used to try to avoid using mine until I realized that my middle chain ring is bigger than the small chain ring on a double (42 vs 39).