Robin Good: Tagul is a web service that allows you to create custom tag clouds while being to control many aspects of your creation.
Tag clouds can be based on URL content, on specific words you input or by modifying a tag list.
Key features include:
- Text inside text
- Rich fonts choice
- Fancy rollover effects
- Custom colors and shapes
- Support non flash devices (ipad, iphone, etc.)
- Export in SVG format
- Only 50kb in size
- Instant delivery through a CDN
- API access
Try it out: http://tagul.com/
(Thanks to Liz Wilson for uncovering it)