I was fairly certain that the Healer's Friend and Improved Recovery enhancements stacked but did a run with my fighter and monk (Fighter has HF 2, Monk has HF 2 and IR 2) and sure enough, a heal spell from the same cleric hit the monk for considerably more HP (I had taken Levik's Bracers off the fighter for this experiement).
If you can spend the AP, you can make your WF Monk more cleric-friendly than the Dwarf Barb standing next to you.
((I was going to post this in the Cost of Healer's Friend thread, but decided this info might be important enough for its own, even if some people already knew it. ))