these are some I use frequently

weight/mass etc converter
http://www.onlineconversion.com/weight_common.htm

currency converter
http://www.xe.com/ucc/

as for dictionary.. good ´ol wiki will do


as for shopping link.. my oh my.. lol

we´ve got ebay

http://www.dealextreme.com/

www.theanimalrescuesite.com

and well, it depends on what I´m looking for hehe.. but basically those are the most used by be that can also be used by anyone.. I have another few locals..