TechWhirl (TECHWR-L) is a resource for technical writing and technical communications professionals of all experience levels and in all industries to share their experiences and acquire information.
For two decades, technical communicators have turned to TechWhirl to ask and answer questions about the always-changing world of technical communications, such as tools, skills, career paths, methodologies, and emerging industries. The TechWhirl Archives and magazine, created for, by and about technical writers, offer a wealth of knowledge to everyone with an interest in any aspect of technical communications.
You can use the evaluation copy for 30 days. After that, it costs
about $35.00 (USD). I used it for about a week and then sent them a
check.
I can't comment on the keyboard navigation--I bought it because it's
very small (1mb download), very fast, and I liked the interface better
than the interfaces for IE or Netscape.