You can now sort oldest first in Google Reader.
This makes things much easier if you prefer to read feeds in chronological order like me, as now you can just hit “N” to page through all your posts, as opposed to scrolling down and then hitting “P” to go backwards up to the top.
It’s actually best to use the space bar now since it scrolls long feeds where-as j/k only show what the browser shows and then moves on.
Ah; I usually just use the scroll wheel for that – but that’s nice to know, since my next laptop may not have a scroll wheel.