I'm so terrible with keeping my favorites bookmarked, but here's a few I really liked!
You Never Forget Your First Love (http://dark-reaction.livejournal.com/72765.html) by dark_reaction (Bobby finds out)
Come Up and See Me Some Time (http://drvsilla.livejournal.com/47642.html) by drvsilla (they're a series of Sam/Dean drabbles, one of which features John observing)
Second Glance (http://ygrawn.livejournal.com/5703.html) by ygrawn (John, if I remember correctly)
5 Times Sam and Dean Almost Got Caught (http://7-daze.livejournal.com/7420.html) by namegoeshere (Bobby, Ellen, John)
Hope you like them :) If I think of more, I'll let you know!
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You Never Forget Your First Love (http://dark-reaction.livejournal.com/72765.html) by
Come Up and See Me Some Time (http://drvsilla.livejournal.com/47642.html) by
Second Glance (http://ygrawn.livejournal.com/5703.html) by
5 Times Sam and Dean Almost Got Caught (http://7-daze.livejournal.com/7420.html) by
Hope you like them :) If I think of more, I'll let you know!