Child Bike Seat reviews and compatibility?

[kayte]

Any good websites comparing child bike seats and/or a site that tells if a seat is compatible with a certain bike?

Any experience with a great bike seat?

I am pretty sure I want a seat not a trailer. Any reasons not to?

I am just starting my research but not having much luck. I *think* I am getting a Trek LIME for my birthday next month.

TIA