If you want to feed only part of your blog within wordpress try this:

http://yoursite.com/your-uri/index.php/category/your-category/feed

If you are using firefox, I think that you would like this extension.
When you are looking a url that you want to comment about, you only need to right click and a small window will open to allow to post..

It has been for ages, but I have just discover…

Extension Room :: BlogThis
BlogThis

As I said before, I like the ability to blog over mail, so a though could come to my mind, and always there is a terminal somewhere where I can run mailx and post it forever… or I could write it up in thunderbird with a better spelling feature 🙂
To do this, I realize that you need to call a script within wordpress called wp-mail.php that access my super secret account.
Some people use a cron job for that, but I think that we can use the .forward functionality to get this done:
more .forward
"|procmail ;/usr/bin/wget -q --delete-after http://casa.che-che.com/blog/wp-mail.php; exit 0"

The --delete-after is to remove the output. and the exit 0 because it returns a status 1 and I could not find the information about why this was happening..