In the first line of the address block, "Senator" is spelled "Sanator."
See Spats McGee's comment (above) regarding the first paragraph. It hasn't been fixed yet.
FWIW, I think this is a commendable idea. A long time ago I either read or was told by a friend who used to work as a legislative aide that there is a definite hierarchy to constituent comments. Phone calls count for the least. Faxes and e-mails (and pre-printed form letters that you just sign) count for little more than a phone call. But a real, live LETTER, that you wrote or typed on real paper and put into an envelope, and bought a stamp for -- those count for a lot.