I know this thread is a month or so old, but...

Just want to endorse glucosamine as being excellent - though I don't take it every day, but when my knees start hurting I take it for about a week...

Also want to endorse Arnie Baker's book - its no nonsense and easy to read and has womens, mens and both-sex issues in it - one of the more frequently referred to books in this house

As for knee pain, like Sadie said... check seat height and also, are you pushing the big gears? Thats a knee buster if you're not careful