potasiyam

This plugin adds a ticker which shows recent posts as headlines. You can set the position top or bottom, fixed or absolute or set the number of posts to show. Some pretty neat features yet to come.

Just Ticker

Adds a ticker bar to your wordpress site which will show your recent post headlines.

LiRo

Adds headline BBCodes to WordPress.
With index: 
[hl]Headline[/hl] 
[hl=1-5]Headline[/hl]
Without index: 
[h]Headline[/h] 
[h=1-5]Headline[/h]

Just Ticker vs WP-Headline