Alternative to Adobe Acrobat reader - it's FOXIT READER (Feb/02/2009 )

Free, light interface, and available here:

http://www.foxitsoftware.com/pdf/rd_intro.php

Here is a wikipeda list and comparison, all what you need...
SumatraPdf is also not bad, and an alternative to Foxit

What about Linux? Evince is good but I noticed that graphics are low quality while comparing it with windows pdf viewers... :/

I like Foxit ... it's free and small software

I always put into my flash drive .... for portable version you can D/L here

http://portableapps.com/apps/office/foxit_reader_portable

I also use Foxit. it is more light and fast (and it doesnt disturb so much with update notifications every day)