InterNews Caveats -- A number of people wrote in response to my InterNews review to note that it isn't as fast as Nuntius and cannot display (though it can save) text after the first 32K, which causes problems with long messages such as the Info-Mac Digest posted in comp.sys.mac.digest (but TidBITS sneaks in, since it's almost always less than 32K). A few bugs were flushed out by the release, and Roger Brown said that he's working on fixing them, so keep an eye out for an update this fall.
Compare More Easily in Apple Mail
In Apple Mail, if you need to work back and forth between two different views of Mail's mailbox contents, you can do so quite easily. For example, you might want to look at a mailbox holding all filtered-in sales orders from the past week while also looking at a smart mailbox showing unanswered customer questions.
To avoid constantly clicking between mailbox views and losing your context each time, choose File > New Viewer window to get a second window and then arrange each window as desired.