Update: This appears to be on a different port for others. As Jax pointed out you can go: Eclipse, select Help -> Help contents to get there as well :o)
I was just going into some help files of Aptana when I came across the local address for the Eclipse Help system at: http://127.0.0.1:58041/help/index.jsp
In there was a wealth of information I just didn't know was on my hard drive ... though I suppose it depends on what plug-in's you've got installed but for me I had:
references and getting started tips for Subclipse, plus ColdFusion Documentation, Using CF extensions for Flex builder (including details of RDS support), Java development user guide, plug-in guide and loads more. The Aptana section is indepth as well with documentation covering:
Check it out
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http://127.0.0.1:65500/help/index.jsp
after lunch (when i stopped/re-started eclipse) it was:
http://127.0.0.1:57631/help/index.jsp
In Eclipse, select Help -> Help contents
:-)