Here's some iShares tickers For treasuries, SHY is 1-3 yr IEF is 7-10 yr TLT is 20+ yr TIP is TIPs For corporates, LQD For aggregate broad based bond market, AGG Here's another one: http://www.djindexes.com/mdsidx/index.cfm?event=showCorpBond
The most common Barometer of the US Treasury market is the 10 YEAR Yield. $TNX.X on TradeStation 10-YEAR TREASURY NOTE ^TNX = YAHOO http://finance.yahoo.com/q?s=^TNX http://www.marketwatch.com/tools/quotes/quotes.asp?siteid=mktw&sid=11420