I've just released FantasyMonster, a Fantasy Sports app that let's you manage all of your Yahoo! Fantasy sports teams. It is much more full featured than the native Yahoo! app and has an intuitive UI.
You can find more info and links at
FantasyMonster App for iPhone|FantasyMonster
Here is the app store description:
Dominate your fantasy teams with the best fantasy sports app on the market. Currently supports Yahoo! Fantasy football, baseball, basketball, and hockey leagues (points, roto, and h2h scoring systems).
Includes unique features not found in any other fantasy sports app:
- Auto-lineup automatically adjusts your daily and weekly lineup across all of your fantasy teams.
- Editing your daily lineups has never been easy with a simple drag and drop interface.
- Quickly search for players using auto-complete
Also supports:
- Add and drop players
- Trade players
- Check live scores
- Check matchups
- Read and post to the message board
- View latest transactions
- View Team Notes
- View standings and rosters
- Check player news
- Check injury reports
- View sports headlines
With nearly every feature that's available on the web, FantasyMonster insures you'll never be out of the loop in your fantasy leagues ever again.