I think cash cow is a good one. Wheel of Wow and Webkinz Wishing Well 2 are good ones too.
By the way you can add friends by finding that little phone on the yellow bar and turning it on. Click on the add button and type in the name. You can't chat freely just yet too.
I was hunting for gems and I found a pearl egg. Then it said it couldn't connect to webkinz world. After a while I went back on and tried to do it again but, it wouldn't let me.
I have gotten a winterfest parka twice. A snowflake sweater 4 times. a winter snowboarding touqe 5 times. Winter scene twice. googles ice sculpture twice. Many other things too.