Is there a place to search ETFs/ETNs?

Yes, you can search for bonds as well on xtf.com. You can search for every asset class by investment objective. You can also search thematically using the Heatmaps.

 

http://www.etfdb.com/

should be able to assist

 

If you're holding these commodity ETF's longer than intraday, make sure you understand the consequences of contango and roll yield.

 

Try this page:

http://www.xtf.com/Research/ETFVolume/index.aspx

 

Thanks so much, you have given a wonderful link. I want to search some good bonds as well. Any help?