comp.infosystemsnewsgroup or two devoted to the system is a good indication.)
http://www.diku.dk/~terra/supposedly has information on Emacs for MS-DOG.
The following Linux documentation is online:
Linux NOW! is a major collection of links.
the Linux Gazette is an online monthly publication. The Linux Weekly News is (surprise!) weekly. There's also the Linux Forum
Russ Nelson has a list of hardware vendors that support Linux.
Red Hat is the Linux distribution I use most.
Caldera describes itself as ``the company who will deliver the power of Linux to business, ... [and] bring commercial accountability and viability to Linux through the release of its Caldera Network Desktop for Internet Access.''
The Debian distribution is ``upgradable incrementally and "in place". This means that users can upgrade individual packages or entire systems when they become available without having to reformat and reinstall.''
Linux for Power Macintosh is a joint venture of Apple and OSF, who have a page on Linux on the OSF Microkernel
For laptops, see Linux on Thinkpads and the Linux Laptop Web site. Fringe Ryder's Corral has a lot of info on who makes which laptop, but not much on Linux.
Also see NCSA httpd/Mosaic: Using PGP/PEM authorization for details on using this stuff in Mosaic. It's supposed to be in Mosaic/X 2.2 and NCSA httpd 1.2.
``You can use the Cypherpunk remailers via a Web interface page... Tools exist to automate the chaining. For details, see [this] remailer page.''
Adam Back maintains a site with a number of tiny cryptographic programs, including the infamous ``rsa in three lines of perl'' .signature file.