Mark has posted what must surely be the definitive overview and guide to the Vorkosigan Saga. If you’ve any interest in reading these books, start with Mark’s post.
For myself, I snagged Warrior’s Apprentice and Mountains of Mourning from the Baen Library. I’ll probably get around to the rest eventually – I’m less interested in Cordelia’s story than Miles’ exploits though. At any rate, figuring out where to start and what to skip just got a LOT easier thanks to Mark’s due diligence.