Here is a sample template you can cut/paste directly into your bug thread and just fill in the blanks. A test case should be posted in the format shown here.
Code:
[B][U]Ext version tested:[/U][/B]
[LIST]
[*]Ext 3.____ rev ____
[/LIST]
[B][U]Adapter used:[/U][/B]
[LIST]
[*]ext
[*]yui
[*]jquery
[*]prototype
[/LIST]
[B][U]css used:[/U][/B]
[LIST]
[*]only default ext-all.css
[*]custom css (include details)
[/LIST]
[B][U]Browser versions tested against:[/U][/B]
[LIST]
[*]____
[*]IE8
[*]FF3 (firebug 1.3.0.10 installed)
[*]Safari 4
[/LIST]
[B][U]Operating System:[/U][/B]
[LIST]
[*]________
[*]WinXP Pro
[/LIST]
[B][U]Description:[/U][/B]
[LIST]
[*]Describe the problem in greater detail here, summarizing the behavior.
[/LIST]
[B][U]Test Case:[/U][/B]
[CODE]
<<insert working code to reproduce the report >>
[/CODE]
[B]See this URL :[/B] http://
[B][U]Steps to reproduce the problem:[/U][/B]
[LIST]
[*] foo
[*] bar
[/LIST]
[B][U]The result that was expected:[/U][/B]
[LIST]
[*] foo
[*] bar
[/LIST]
[B][U]The result that occurs instead:[/U][/B]
[LIST]
[*] foo
[*] bar
[/LIST]
[B][U]Screenshot or Video:[/U][/B]
[LIST]
[*]attached
[/LIST]
[B][U]Debugging already done:[/U][/B]
[LIST]
[*]none
[/LIST]
[B][U]Possible fix:[/U][/B]
[LIST]
[*]not provided
[/LIST]