Script of Website Thumbnails Creation Like Google Instant Preview

Is there any script that is working like the Google Instant Preview ?? That gives the Small Preview of the w开发者_运维技巧ebsite

There are quite a few if you search for "site thumbnail" on google. Here is a sample of the results:

• www.thumbalizr.com
• websnapr.com
• snapcasa.com
• thumbshots.com

I don't have specific recommendations, but they all seem decent and some free packages. Some others I found by checking for Similar sites:

• www.picoshot.com
• thumboo.com