I have my moleskines(α) and wheelbooks(β) from as far back as the late 90s. Wouldn't trade them for the world. That said, I transfer some things into other formats, like my Remember-the-Milk account, scans of particular pages, etc.

α http://www.amazon.com/Moleskine-Square-Notebook-Pocket/dp/88...

β http://www.amazon.com/Book-Memorandum-Green-Log-pack/dp/B000...