Finally! The church has added General Conference talked to iTunes as Podcasts. Here is the direct link to adding the Podcast to your iTunes:
General Conference All Speakers MP3 Podcast of The Church of Jesus Christ of Latter-day Saints
You can subscribe with other programs as well here:
You can also find other church resources that you can subscribe to, such as “Teachings of Presidents of the Church”. You can find those here:
LDS Church Web Feeds Subscription Index
And, of course, you can find all the talks in different formats here:
178th Annual General Conference, April 2008