“When Pesach passed, I unchecked all my Pesach shiurim, and removed them from my device (you can set up the Itunes to only copy checked items).”
This is good advice & I do it as well. There are a number of good FREE shiurs by rabbis such as Rabbi Noach Weinberg, Rabbi Akiva Tatz, Rabbi Dr Dovid Gottlieb & many more.
I used to ride the train everyday (2 hour round-trip, 5 days a week) & carrying/reading a book was not only hard, but dangerous at times. But I found that with my mp3 I could get in an extra 10 hours a week of learning a week (& unlike a real shiur, you can play it back to catch things that you might have missed). Technology, if used correctly, can be a very great tool in learning Torah.