I like my gadgets but I carry too many of them as it is without having a second eReader. In addition to the Kindle, I carry two phones (blackberry for work and personal phone) and my pmp (to listen to music and watch videos). Not to mention, I don't need another device to charge, convert and keep loaded (I often convert new cds and videos for my pmp and an occasional library book for my Kindle).
Besides, one of the reasons I bought a Kindle was not having to decide "which book" to take with me each day
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(That being said, if a far superior eReader for my desired use came out, I might switch but keep the Kindle on the side only so I could buy from Amazon. But I don't see anything in the immediate horizon that would tempt me to do so at current prices).