My macbook is much slower than usual

About 2 weeks ago I noticed the MacBook was running slower. Slower starting up, and slower to start applications. The beachball comes up more often & it will temporarily hang up mid-word, while typing an email or a web address sometimes.
2 GB RAM, Still more than 60% harddrive space open, The problem exists even when only one application is open, MacBook is 1 1/2 years old.
So...I'm wondering, could I have applications open in the background upon start-up without knowing it?
Was there a recent update that could have caused this?
And most importantly, is there a cure?
Thanks in advance!!

Andrew,
I did as you suggested, and I don't see any program that is using double digit percentages of the processor. The history shows almost nothing and then huge spikes when it does anything (like go to the previous webpage, or scroll down in the document).
When I ask the computer to do pretty much anything (like update a saved a file that has one more word typed in), the spinning beach ball pops up for a minute or two. Then other times, it will act fine for 30 minutes and then very sluggish again.
Start-up times are anywhere from 7 minutes to 30 minutes. It used to be 1-2 minutes. Start up hangs up most on the apple with the little circle below.
I tried rebooting the PRAM (command, option, P, R).
Thanks for any help you can offer,
Jennifer

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Date: Wed, 11 Apr 2012 15:25:25 -0600
From: [email protected]
To: [email protected]
Subject: ACR processing in CS6 much slower than CS5
    Re: ACR processing in CS6 much slower than CS5
    created by Noel Carboni in Photoshop CS6 - View the full discussion
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