Q: JavaScript Slider I'm interested in creating a web interface where a user can break up a "timeline" into various chunks.
Start|-----------------------------|End
         ^marker one   ^marker two

They would be able to add a marker (and label it), and then move the marker around adjusting its position.
All the sliders I've looked at so far only support one slider between a range of values
Is there any existing jQuery plugins or any other javascript libraries (or even HTML5 /SVG ) that have a good starting point for this feature already?

A: Sounds like you're talking about something akin to a slider with multiple handles, rather than a timeline as such. The SIMILE timeline is probably the best out there, but it doesn't allow for dynamic band creation as far as I know, so I think sliders are your best bet. Here's a jQuery UI slider demo, with two "handles":
jQuery UI range slider demo
