ZenMojo.com

Web:
Zamzar lets you convert many different types of files in addition to video files: http://www.zamzar.com/

Keepvid also lets you save Streaming Videos: http://keepvid.com

Apps:
If you want to save that great Google Video or YouTube video, you need this tool: VDownloader
If you want to save a streaming Microsoft video (like an ASX playlist), then this is the tool you need: SDP Multimedia

http://tetlaw.id.au/view/javascript/really-easy-field-validation

Here is a great, open source, flash photo gallery creation program that works directly with picasa:
Applejuice

And there is also a script that will create the gallery on-the-fly on the server:
Applejuice Build Gallery

EDIT: If you just want to add a little pop to your existing html photo gallery, there is a great javascript called Lightbox.

Also, here is a guide to a bunch of Lightboxes
and Smooth Gallery

Here are some plugins for Picasa to make galleries:
http://webscratches.com/2007/04/03/slideshow-generators-plugins-for-picasa/

http://galri.free.fr/

http://www.paulvanroekel.nl/picasa/ 

http://www.google.com.my/intl/en/help/cheatsheet.html

Web:
Zamzar lets you convert many different types of files in addition to video files: http://www.zamzar.com/

Keepvid also lets you save Streaming Videos: http://keepvid.com

Apps:
If you want to save that great Google Video or YouTube video, you need this tool: VDownloader
If you want to save a streaming Microsoft video (like an ASX playlist), then this is the tool you need: SDP Multimedia