The mail app ins't bad. A bit of a departure from the 'standard' mail apps, especially when batch deleting.
Just a shame my ancient, 13 year old Yahoo account gets nothing but spam due to my ingnorance of signing up for stuff back then. Handy to keep around as a dump box for sites that insist on registration though.
While on the marketplace I noticed that there do seem to be a few independant Y! apps that have now had the rug pulled from beneath them by the official app.