There is an argument that people are more inclined to listen to there podcasts in front of there pc. So why would service like Podlinez and Fonpods work. The advantage of these services is that potentially it makes it more accessible to deliver content to user. Particularly through wi fi. Everyone has a phone, and in this way there is a potential infrastructure to deliver content.

I think there success as mentioned before is on phones syndicating themselves with popular podcasting shows. Some people, I believe will be put off by the flat rate of these, as it is phones are already expensive/but say for instance, if they where part of your package when you are signing your mobile phone. Instead of getting 100 free texts a month you choose the unlimited podcasts on your phone rate instead.

I am not sure about the success to these services especially with the threat of the apple Iphone coming out soon Handheld devices are getting more and more ubiqtous, and I think most people would choose to carry it all around in one device rather than having there pockets full with unnecessary baggage.
I believe apple if they get this right could make a serious inroad into phone market as well as tightening there stranglehold on podcasting