Well here is one I use for most sites...it works fairly well
Sitemap:
http://yoursite.com/sitemap_index.xml.gz
User-agent: *
Disallow: /admincp/
Disallow: /clientscript/
Disallow: /cpstyles/
Disallow: /customavatars/
Disallow: /customprofilepics/
Disallow: /images/
Disallow: /modcp/
Disallow: /ajax.php
Disallow: /arcade.php
Disallow: /attachment.php
Disallow: /calendar.php
Disallow: /cron.php
Disallow: /editpost.php
Disallow: /global.php
Disallow: /image.php
Disallow: /inlinemod.php
Disallow: /joinrequests.php
Disallow: /login.php
Disallow: /member.php
Disallow: /memberlist.php
Disallow: /misc.php
Disallow: /moderator.php
Disallow: /newattachment.php
Disallow: /newreply.php
Disallow: /newthread.php
Disallow: /online.php
Disallow: /poll.php
Disallow: /postings.php
Disallow: /printthread.php
Disallow: /private.php
Disallow: /profile.php
Disallow: /register.php
Disallow: /report.php
Disallow: /reputation.php
Disallow: /search.php
Disallow: /sendmessage.php
Disallow: /showgroups.php
Disallow: /showpost.php
Disallow: /subscription.php
Disallow: /threadrate.php
Disallow: /usercp.php
Disallow: /usernote.php
Works fine and never get errors..Though I have showpost removed because using vbseo..If you do not have vbseo..You may want to take that out
thanks 
Linear Mode
