The new version of Google Reader looks very similar to Gmail (also the new Google Groups), so you can't help wondering if the two products are about to merge. Mihai Parparita from Google Reader doesn't offer an answer (probably because there isn't an answer yet), but he created a Greasemonkey script that adds a new link in Gmail: Feeds. The unified interface is almost flawless as a design, but Google should improve Google Reader's loading time as it loads slower than Gmail. Another thing I'd like to see is adding Google Reader's in-place message opening to Gmail, so you can read the messages faster, as the snippet is often insufficient.
Install Greasemonkey in Firefox or Trixie in IE | Add the script