I've always loved my Otterbox! However, after visiting MacWorld...
www.iballz.info (very cool concept)
www.seidioonline.com (I have used them on my BB for years)
www.modulRcase.com (picked up this at MacWorld)
www.zagg.com (I love their screen protectors and tempted to buy the ZaggMate)
www.usplusu.com
www.mymophie.com
www.sleeve360.com
www.tabgrip.com
www.trexta.com
www.ektopad.com
www.gelaskins.com
www.handeholder.com
www.thehandstand.com
www.fastmac.com
www.keydex.com.tw
www.moshimonde.com
www.revenastyle.com
(I am not endorsing any of these products but just passing them on as a public service)