iGoogle stands for interactive Google (formerly Google Personalized Homepage). It is a customizable homepage originally launched in May 2005. Updates include the capability to add web feeds and Google Gadgets (similar to those available on Google Desktop).
The iPhone optimized version of iGoogle lists all feeds and gadgets in one column. You can also select individual tabs at the bottom of the page.
The address for iGoogle is: http://www.google.com/ig/i