For in your .htaccess whenever you are listing a serie of files (in a testsuite for example):
IndexOptions DescriptionWidth=* NameWidth=* FancyIndexing FoldersFirst ScanHTMLTitles
If you want to give documentation on those files:
IndexIgnore readme.txt ReadmeName readme.txt
See the mod_autoindex Apache 1.3 module or the mod_autoindex Apache 2.0 module. Really cool.