I find InfiniTubes to be intriguing, yet other item transport systems have had my attention. If this were part of a larger technical mod, such as a storage system, it would probably be more satisfying to me, references to Applied Energistics notwithstanding. Perhaps simply including a "magic" chest with upgrades to expand its inventory would be sufficient. Adding a crafting machine would be de riguer at that point.
Tiny Carts is awesome, but you're right that it's incomplete. Fun, though.
RedLogic: keep, please. I've been using Redstone Paste because I want a lightweight, up-to-date mod for redstone wiring, but I also want logic gates, which Redstone Paste doesn't offer (only the repeater and comparator).