[jQuery] "Uncompressed", "Minified and Gzipped" and "Packed"

[jQuery] "Uncompressed", "Minified and Gzipped" and "Packed"


Hello,
Most JQuery plugins, including JQuery itseld, offer three versions:
"Uncompressed", "Minified and Gzipped" and "Packed".
1. Should I use "Minified and Gzipped" or "Packed"?
2. How can I create myself the "Minified and Gzipped" or "Packed"
versions from the Uncompressed version?
Is there any software for this?
Thank You,
Miguel