I toured (supported tour) w/Felt F65
there is a fellow I was referred to (from the ultra-light tour group at yahoo groups) who used a seat post rack and did ultra-light touring w/the same Felt model.
Personally, altho it is a swell fast bike, I became frustrated with the inability to add racks et al (I know... I can only blame myself for not noting this shortcoming)
This bike DOES take a 700/28 Conti Gatorskin tire, but that is about it
The tires had low spoke count (another strike against it being a good tourer)
after a week on it, my mid-aged body started to get a little cranky (YMMV)
I have since rectified that by acquiring a bike that will serve my needs of occasional touring and local riding/commuting, and has tons of braze-ons for all sorts of evil weight bearing items