I have been working extra hard this past week to finalize a iPhone web application. It's called Podcaster and it allows you to setup and stream podcast to your iPhone or iPod touch. It looks and acts very similarly to the native iPhone app so you will have no learning curve. It also feature a podcast directory so adding podcasts is easy and fun.
New features include
Podcast played/unplayed separation
Listen to past and present podcasts (your not limited to the current episode)
Get useful information about podcast including contact email and phone number
Podcast now feature tags
Improvement to the podcast directory include
top 50 podcast list
tag cloud with categories
It's a great app that I designed for myself but I'm sure others will find it useful.