Slightly Eclectic Guildford Ukulele Ensemble

Links Page

http://www.ezfolk.com/uke/Tutorials/Fingerpicking/fingerpicking.html
Has some good patterns for practise along with soundfiles to show you how they should sound. (Will only play on a PC with MIDI on the soundcard)

http://www.alligatorboogaloo.com/uke/tabs.html
Has a good range of well presented Ukulele arrangements.

http://www.muffin.net.nz/
The tabs for songs arranged by New Zealand's "Serious Ukulele Ensemble" and the "Big Muffin Serious Band" can be found on their web site. Some are suitable for adobe Acrobat, while there is another page of tabs in Powertab format which is useful for having the computer play the arrangement for you to hear it.

http://www.brookadams.com/jumping-flea/ukeSongs.html
find the songs you like then visit his audio page:
http://www.brookadams.com/jumping-flea/ukeAudio.html
to see how they sound.

I know this site is in French, but you've gotta love these guys !
http://www.ukuleleclub2paris.com/main.htm