This was also posted on the front page a while ago. Just adding it here for completeness.

In case you haven't noticed, we've released a few new features in the past few weeks!

1. Reviews
We've had the recommended anime thread for a long time now, but it's hard to tell if a specific show is good or not. So now you can write your own reviews! Just go to the series that you want to review (like Gintama Reviews , and click Write a Review or press the Reviews tab.

Everyone can write reviews, but make sure they are good quality or they may be deleted. If you use images, make sure to keep them small.

2. Watchlists
Keep track of what you've watched! Add all the series you've ever seen, even if cr doesn't have it! For the ones that cr does have, it'll automatically update your watchlist! Just go to any series page and click on the Add To Watchlist link. Check mine out! (yes, these are actually the shows i've seen or plan to watch ;P)

3. Twitter Integration
If you use twitter, you can link your twitter account to your cr account! Just click here: http://www.crunchyroll.com/twitter. Your twitter status will be updated whenever you update your cr status. You will also automatically tweet when you watch a video (of course, you can always turn it off if you dont want it), and follow me (@crunchyroll). You can also easily tweet about videos manually by clicking the Twitter icon on the video page.

So follow me on Twitter if you want to know whenever a new simulcast episode launches, or to get some inside scoop on me and crunchyroll

4. Other
- We now have a spell checker for reviews and forum posts.
- You can now use smilies in user guestbook posts!
- as usual, there's a bunch of stuff that happens under the hood on a weekly basis, I'm just highlighting the more visible changes

I like the new updates shinji! ^^
The review option is a great idea!
and it's cool how you added a watchlist, it's a lot easier for me to watch my anime now. :] and it's nice to see what my buddies like to watch.
twitter's cool, it's a shame i don't have an account though
and i really like the spell checker! ^^ i'm a horrible speller, so that really helps me!
wow, the smilies in guestbooks are definitely new, i like it! everybody wanted those back then. xD

well, thanks for the update! it helps..
i've been on a long hiatus here, and when i came back, it was all new to me! i didn't recognize it at all... o.o

I like the new updates as well, especially the private albums and the reviews. Thanks a lot.

Cool updates but, what's with the twitter? Is it really that special?

What is the use of having a watchlist on CR when I can't even watct the videos I want here? It's so redundant.

All great. But I wanted to ask about a newer thing, is it possible to delete the achievements?

that's coo & great

Yay!

I simply like the new features but .. i still miss my old profile .. the one that have the header on top of my picture. That's all~ I love the Achievements, the free ones .. hehe. XD