Here's a tip that might help others new to Infopath like myself.
I read with interest in tips & Tricks the following regarding how to enable InfoPath Email Features:
http://infopathdev.com/howto/tips/default.aspx?i=f51a0baec2cc4785a879810e04a8490bAfter an SP2 patch, guess what? "Send to Email" had dissapeared.
I eventually resolved it by running "Detect & Repair" from the Help Menu.
Worked for me, I hope this helps someone.