Hi,
I really like the mobile site but there are one or two issues that could be dealt with.
Links to pages that don't actually exist should be in red like the actual Wikipedia. At the moment they're blue like the other internal links so you can't tell which articles exist and which don't until you've actually clicked on them.
Another thing that could be added is an easy way to delete text in the search box. I use an iPod Touch and most search boxes feature a small 'x' in the far right which allows you to delete all the text and start typing from scratch which saves time constantly backspacing. Google uses this feature and I think that it would be a welcome addition to this mobile site.
Keep up the good work.
Sean O'Brien.