Having looked at enough of them to make us sick of the things, we're pretty sure how to define a netbook at TR, but what does Intel think? At an MID briefing, mobile technology blog, JKOnTheRun, got Intel to share its internal definitions so we can confirm that no, netbooks are not just defined as sub-notebooks that are "fine for an hour" of use - despite what one Intel exec thinks.
Netbooks, then, are defined as clamshell notebooks with 7in to 10.2in screens, "purpose built for internet use". That suits everything from the original Eee PC 701 right up to the Samsung NC10; but excludes the Dell Mini 12 - a seclusion I am happy to agree with.
MIDs, meanwhile, are defined as having 4in to 7in screens with a clamshell, slider or tablet form factor and geared towards "Internet-based targeted usages". Specifically, Intel expects MIDs to be aimed at productivity, entertainment, information or communications and tailored directly to fit those tasks.
Apparently a bunch of MIDs should be on show at CES, which will be good as the category doesn't really have anything to show for itself right now. The (ludicrously expensive) Sony UX1 is about the best example of such a device, although not as specialised as Intel is talking about.
Clarification, it's a beautiful thing.