Yes, actually, if I waited not to be shy and reticent to join social groups, I think I might *still* be waiting to start kindergarten : )
She is certainly shy - and I can see how a kid who was more outgoing would have less difficulty with a grade skip. She is considered to have "normal" gross motor skills for a 3.5 year old as far as the developmental charts go... so would therefore be behind the other older kids if she skipped. But she really is no athlete - I have to admit... and I love my daughter to death... but she runs like a duck and dances like Elaine from Seinfeld. She kicks butt at reading though : )
My understanding of the literature is that kids that are moderately gifted (as my daughter seems to be) can do well when kept with their same age peers... and that it is the kids that are HG or PG that really *need* to be skipped. It does still irk me a bit when I see that all of her grade equiv. fall solidly within the first grade year -- I start to think that she really will learn *only* social skills for the next several years... I know social skills are very important, but it certainly would be nice for her to learn *something* academic at school.