In many presentations of late I have mentioned to folks the preference of Enterprise Services over .NET Remoting. In part to reduce the risk associated with rolling your own security model across boundaries (among other things), and due to the fact that the Indigo team at Microsoft recommends Enterprise Services as the way to build your component architecture today, to better migrate to Indigo tomorrow.
Here are some references I found on the subject on Rich Turner's blog (he's a PM) and a video on the MSFT site. If I find more, I'll add to comments. If you have your own proof, or have questions/concerns on this subject, YOU add to comments :)
Cheers.
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