OS level security settings for MySQL base and datadir

[Eddie Jr. Panes]

Hi, I'm new to securing the base dir and data dir of mysql (installed from a tar.bz) and here are the directory settings:

drwxr-xr-x 2 mysql mysql 4096 Jan 14 2008 bin
-rwxr-xr-x 1 mysql mysql 801 Jan 14 2008 configure
-rw-r--r-- 1 mysql mysql 19071 Jan 11 2008 COPYING
drwxr-x--- 4 mysql mysql 4096 Jul 22 15:18 data
drwxr-xr-x 2 mysql mysql 4096 Jan 14 2008 docs
-rw-r--r-- 1 mysql mysql 5139 Jan 11 2008 EXCEPTIONS-CLIENT
drwxr-xr-x 3 mysql mysql 4096 Jan 14 2008 include
-rw-r--r-- 1 mysql mysql 8530 Jan 14 2008 INSTALL-BINARY
drwxr-xr-x 2 mysql mysql 4096 Jan 14 2008 lib
drwxr-xr-x 4 mysql mysql 4096 Jan 14 2008 man
drwxr-xr-x 9 mysql mysql 4096 Jan 14 2008 mysql-test
-rw-r--r-- 1 mysql mysql 1410 Jan 11 2008 README
drwxr-xr-x 2 mysql mysql 4096 Jan 14 2008 scripts
drwxr-xr-x 3 mysql mysql 4096 Jan 14 2008 share
drwxr-xr-x 5 mysql mysql 4096 Jan 14 2008 sql-bench
drwxr-xr-x 2 mysql mysql 4096 Jan 14 2008 support-files
drwxr-xr-x 2 mysql mysql 4096 Jan 14 2008 tests

Questions:
1. Should all these files and folders be owned by mysql?
2. are the file permissions enough or should i remove all Others from reading and executing?
3. Are there any folders or files that are not anymore necessary once the server goes into production and should be deleted?

TIA.