Quite a few times I've noticed some lovely cards and makes where the blogger has said they'll be linking into the Snippets Playground. And then they don't do it!
I know it can be hard if you do a scheduled post to remember to go back and make sure you actually link up to the challenges you list. But, it seems such a shame to me - even if you aren't playing for a prize - being linked means that folk will visit you and comment. I certainly will!