I'm an ex-Catholic, thankfully...though the Catholic guilt still sticks with me (yeah, the Jewish don't have a monopoly on that! lol). I haven't given anything up for lent since I was a kid. I believe in moderation, not omission/punishment.

What a weird thing to give up (lj/blogging) in the name of writer's block. I was always taught that if you have writer's block, you need to write more, not less, and just be unstructured about it (write whatever comes to mind, stream-of-consciousness).