Works also for me (stock kernel 2.6.31.4-1, catalyst and catalyst-utils 9.10-1, xorg-server-maximize-fix 1.6.3.901-1 on i686 and Mobility Radeon HD 3470). It's a pity that we still need a patched xorg server to get decent speed when maximizing windows in kwin. But maybe it's an xorg-related problem, not a catalyst problem. Let's hope that server 1.7 will fix this...