It doesn't try to explain the differences, but you might find the quickstart guide from the sourceforge download page useful

I have the same question. It's just too risky to use JBoss3.0 at this moment without a complete document.

Anyone can explain the directory structure "all", "default", and "minimal" in 3.0? it's different from 2.4.x.

JeffCo

Too risky for whom and what purpose? Not to be picky, but the source code is the most complete document about any software system, and you will note that it is available for jboss. Perhaps you meant "concise and to the point for the purposes I want to use jboss for", however you did not indicate what those purposes are.

minimal == jmx + logging + (I think) jndi. No ejbs or much of anything else.

default == minimal + tx + ejb + jca and jdbc + servlets/jsp + jsr77 etc

all == default + clustering + iiop + jboss.net

> Too risky for whom and what purpose? Not to be
> picky, but the source code is the most complete
> document about any software system,

Not to be picky myself but this is a bit unfair. I'm a believer in the "software is the most accurate documentation" philosophy, but when a system changes as significantly as JBoss appears to have changed from 2.x to 3.x, it warrants some straightforward documentation.

> and you will note
> that it is available for jboss.

This is true, but it is also a separate download that not everyone may be willing to do.

> Perhaps you meant
> "concise and to the point for the purposes I want to
> use jboss for", however you did not indicate what
> those purposes are.

Yes, this is what is required...in general. Source code aside the following basic (and brief) documents are useful for ANY software system:

install -- how to install/run
changes -- indicates key changes from previous version
usage -- basically how to use the thing in 1-2 pages

This does not seem to be unreasonable.