How can I reinstall my OS without the original disc?

I recently upgraded the internal disc in my MacBook Pro 2.53 GHz Intel Core 2 Duo. I had a 320GB and put it a Western Digital Scorpio Blue 500GB. I didn't have the install disc and used the restore option in disk utility to copy files to the new drive before inserting it. It now works, but it's slow to load-up. How do I reinstall my OS, to optimise it? I've lost my original install disc and have since upgraded to Lion 10.7.4
BTW - my new drive also has some strange noises and I'd like to replace this with a new one ASAP. Is there anything else I need to be aware of?
Thanks

Check that you have the Lion Recovery disk on the your Western Scorpio. To do so, just restart the computer holding down the OPTION key.
After a short while you should see the available boot disks. If the Recovery disk is present you will see something called Recovery HD.
Click on it, and choose 'Reinstall Lion' from the window that (eventually) pops up.
To swap the OS to another HD, use a utility like Carbon Copy Cloner to clone the volumes on the current internal disk to another disk. Swap your drives over, and clone back to the new internal HD that you put in.
EDIT: yup, I agree with Shootist about Western drives. Seen many bad reports about them.

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