Am not switching from Bloglines to Google Reader yet!
Reasons:
1) In the Settings > Subscriptions screen, there is a “Filter by name, tag, or URL” option. There doesnot seem to be a way to realise “show all feeds with no tags!”. This is very important to organise feeds !
2) Also there is no hierarchical display of subscriptions by tags!
There are many who have switched from Bloglines to Google Reader like Geek to Live: From Bloglines to Google Reader