Moleskine user/lover here too. I carry a pocket-sized Moleskine, pen and iPhone almost everywhere I go. It's faster and more enjoyable to write notes in the notebook than in my iPhone (the latter increasingly freezes with iOS 4.0 and even without that has lots of annoying UX quirks), and I can easily go back and forth between text and doodles/diagrams, unlike the iPhone (built-in apps anyway, admittedly.) If you just want the cheapest paper possible, Moleskine is a bad choice. But if you want the best experience as a writer/reader/geek, Moleskine is a no brainer.
I have switched from Moleskine to Piccadilly brand (I think this is the house brand of Borders Books). Half the price, almost the same quality.
The problem with Moleskines is that they got too popular, so they keep switching around the source for their paper; while earlier (circa 2005) Moleskines had paper that fountain pens wouldn't bleed through, later ones of the exact same type do have paper that fountain pens will bleed through.
Another fountain pen lover here. I got a Mont Blanc for a 21st birthday present with a gold nib. However I've ran out of ink and haven't gotten round to getting some more.
interesting to know, thanks. I just got into Moleskine a year ago or so. i haven't experienced any bleedthrough with the Pentel ballpoint point I pimped in another comment in this discussion. I think B&N has a store brand they promote too but I haven't tried it yet.