I found an article in one of the Arsenal Blogs and it definitely has a ring of truth about why Stephen Appiah AKA The Tornado is West Ham bound and not Arsenal.
Excerpt from the Blog 7amkickoff
After reviewing the films,
I can say with 100% certainty that I want Stephen Appiah on this Arsenal team but I [...]

Like many fans I wish both Zamora and Pantsil all the best at their new club Fulham.
Bobby will be missed, he is a West Ham lad through and through, and put alot of grafting in at our club. Although not a prolific goal scorer, his determination, loyalty and hard work could never be faulted. Topped [...]

Well, West Hams rumour mill for the summer is in full flow, with the usual amount of newspaper speculation reserved only for a slap of meal of rumour brunch.
So lets begin with the starters: James Harpers name has been flying about abit, but I can’t see this one going down the gullet. Sammy Traore [...]