There is one way, though, that I have found to be somewhat successful. If he's in the mood, I will sit Dylan on the floor with a pillow in front of him (as well as in back - I don't trust the little guy to not fling himself backwards quite yet). I place the pillow on top of his legs so that he is able to slightly lean on it. I also put a toy on top of the pillow to keep his interest as well as to distract him from the realization that he's sitting, as that tends to send him into said flingingness.
Today he sat long enough for me to snap a few pictures. I would say that his total sitting time was about 3 maybe 4 seconds before he flung himself backwards. But still! It's a start, right?
Another exciting success today was achieved by Dylan's big sister, Cassidy.She received her first sticker on her potty chart! We were playing this morning and all of a sudden I noticed that she had "that look". I asked her very nonchalantly if she wanted to sit on the potty. I fully expected the usual, "NO! NO! I don't want to sit on the potty. NO!". But instead she looked as me and said, "Yes." I put her on and...well...success! Yeah Cass!
Whew. It was quite the exciting day around here I tell you!!