For those who like using native email applications (like Apple Mail etc.) but are frustrated that they don't integrate well with Gmail, Sparrow for Mac and iPhone (an iPad version is currently in development) is something you should definitely check out (they have a Lite version on both platforms). Sparrow provides the best Gmail experience in a native app I have found. The UI is very clean and well thought out. Another nice touch is it's Facebook and Gravatar integration (for contact pictures) and Dropbox integration.
All in all, it's a pleasure to use.
What's a "gmail experience"? Gmail exposes both pop3 and IMAP (and iCal for Google Calendar), any MUA (mail user agent) can work with it and provide any experience it wants.
I have often benefited from recommendations for Things I Didn't Know I Wanted.
Given that Less Wrong is a community of unusually intelligent, critical, and self-improvement-focused people, I suspect we can generate a pretty helpful thread of product recommendations — perhaps even a monthly thread of product recommendations.
Rules: