My favorite client on Windows was Azureus and when I bought the Mac I continued using it. The thing is, Azureus has many nice features mas it is fat and recently was turned into something I definitely do not want. I just want to download some files on ocasion and want the process to be fast and light.
Then I found Transmission. It’s small, light and works like a charm. Perfect!
Here’s some screenshots (you can find more on the project’s homepage):
The main window:
With the download in the screenshot in progress the application used 26MB of memory 
Transmission is now part of my Essential Apps.
Bloppy - Track blog comments!
Mário is this month’s hero on productivity. Well, at least mine ;)How do you track comments you’ve made on someone else’s blog? Keep the pages open and check them once in a while? Bookmark them for future checking?Well, Mário solved that problem when he launched Bloppy:
There’s even a Mac OS X widget :)Kudos to Mário, nicelly done :D