I installed the WordPress Mobile pack recently. I haven't had too much time to play with it yet, but I like it so far. Seems to make mobile use of the site far easier, though it reveals some flaws in my site layout. Currently the biggest issue outstanding is that subpages aren't easily accessible since the list of subpages isn't visible for any given page. I have that on my list of to-dos and hopefully I'll get it resolved soon.