Now this is barely worth blogging, but one of the things I used a lot when I was confined to cmd.exe (yes, "confined" is the word I would use, 4NT aside) is the wonderfully simple copy con filename.txt then type a few lines and end it all with CTRL+Z and enter. So, if you're a PowerShell noob and yearn for this olden-days simplicity like dead parrots pine for the fjords, then this is for you:
I saved this to copy-console.ps1 and aliased it to "cc." Of course, you can do whatever you want - it's probably easier to just put it into a function in your profile. Just place the script above into your profile and remember: CTRL+Z then enter to save.
UPDATE 2008-04-04: Somehow I completely broke this in my attempts to "clean it up" before posting. I've reposted a better version (imho), and implemented encoding support as suggested out in Jason's comment below
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