May 26th 2010 7:03PM You can sync your calendar with Google Calendar... You can filter it for raid resets, instance invites, etc too. If I remember correctly the link is somewhere up the top of your characters page in the armoury...
Not so sure about chatting from outside of WoW, but perhaps with the Real ID system we'll get an independent chat client too. Though you would still only be able to chat with your battle.net friends presumably...
Apr 29th 2010 7:21AM Got to agree about GearScore... A number alone doesn't tell you enough to judge a player, which is why I much prefer Elitist Group. Even though it's not particularly popular (mostly because GearScore is everywhere) it offers up a much better info set IMO.
You can see how much of a players gear, gems, or enchants match their class and spec. For example: a DPS with a +defence gear won't score 100% on gear, and the offending piece is highlighted in inspection.
You can also see what they've achieved in dungeons and raids (split by tier), and in the case of alts, what a player has achieved on their main. No more trying to explain "I've done ICC, just not on this alt!"
Lastly, you get ratings. When you finish a dungeon with someone you can rate them, and add a comment as necessary. Tank managed aggro well? DPS kept pulling adds? Note it down.
Your database of ratings gets shared to guildies too and players with low ratings get flagged when you group with them. While open to abuse, it does allow you to spot people your guild has played with and whether they were awesome or utter fail.
Best alternative to GS that I've found, with 3 decent ways to judge a player rather than one very arbitrary one.
You can get it at http://wow.curse.com/downloads/wow-addons/details/elitistgroup.aspx