The trio of Henry-Eto'o-Messi in 08-09 was probably the most entertaining football spectacle I have experienced on TV. Guardiola did an amazing job converting Henry to more of a winger/striker hybrid, in the sense that if he needed to play in the middle he would and if he needed to hug the touchline he would. He also provided quite a bit of assists to Eto'o and messi IIRC. I really respect Henry for really taking a secondary role to what he was used to at Arsenal. Many footballers of his caliber would complain and go to the media but it was very respectable that he accepted Guardiola's tactics.
On a side note, that trio would score goals for fun and many times it looked way too easy for them. It was also very entertaining watching Messi still be a winger and have extremely fast acceleration. It was insane how fast he would pass defenders with his quick bursts. For me that 08-09 season is the best season I've watched as a Barca fan. Just a combination of everything: Technique, physicality, speed, and spirit.