The recommended way to unclog print head is to run deep cleaning once or twice and then leave the printer for 24-48 hours and hope the wet ink will break down the dried ink in the nozzle. This is the slow safe method.
http://www.posteriza.com
Found a freeware poster maker...not quite as slick as Pro Poster but it is Vista capable so it doesn't turn off the theme like pro poster would.
1. The Canon website has the specs for all the models.
2. Hobbicolors sold on eBay is good. Also Formulabs sold here: http://www.alotofthings.com/viartshop/products.php?category_id=2
Don't do any of those things...simply leave the printer plugged in and turned on and you shouldn't have any problems with clogging.
I've gone 6 months without printing and still printed a photograph flawlessly.
I assume you guys are using good ink like Canon's or Hobbicolors.
I bought a MP160 just for the scanner and have gone 6 months without printing anything and then printed a few documents and it works fine.
I also leave it plugged in and turned on as well, don't have to wait around for the initial start up stuff to occur.
The bottom plate cleaning really should clean it up but maybe you have been doing a lot of borderless pictures and it has over sprayed ink all over.
This is the option:
I found a MP160 for $19.99 and bought it on a whim. It gets used for those times when a simple copy is needed. The space issue is the main reason all in ones are so popular and I understand that.