Adobe DNG format was hailed as the "new" RAW when launched, it's claimed to be the archival format, you never need worry about whether you'll still be able to convert your RAW images 20 years down the line.
Personally I have always had my doubts first off there's not a huge support for DNG and I suspect if Adobe ever go bust what support there is will soon disappear. Secondly There's different versions of the DNG format it appears, some software saves to DNG with differing parameters, not storing all the information in it. Thirdly it's well known that some RAW formats carry data specific to their own software, Adobe leaves this out in some cases so you may loose things like lens correction that you'd get with the makers own software..
Lastly and of bigger concern it turns out that Adobes DNG doesn't carry all the RAW data, apparently data from the edges of the frames are left out with some cameras, this means your loosing important data, just what you don't need in archival software.
By all means convert to DNG, it'll be handy if your older version of photoshop doesn't support your brand new D3x or whatever, it means you can still use CS instead of forking out £500 for CS4 (CS5 next April-ish) and it means you do have another back-up just in case your old RAW isn't recognised by the latest version of whatever software you use, but DO keep your original RAW images, don't rely totally on DNG, you don't know what your chucking away!
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