The number one mistake I see with newcomers to joomla is a failure to understand the Section, Category, Article structure of content.
How many times do you see people either reject joomla or spend hours developing complicated and convoluted solutions to satisfy their desire to have nested sub-categories?
And yet the truth is you don't need them. The problem is that they are trying to match their frontend menu structure with their backend filing system.
A few weeks ago I was chatting on skype with Fotis from joomlaworks.gr discussing the merits of various different RSS news readers or aggregators.
Despite trying several neither of us really were satisfied with what we had found.
I started this blog in response to a few of my friends "demanding" I put some of my thoughts and tips & tricks down in writing.
Of course I hopped that other people would stumble upon this blog and find it interesting but I never expected the readership to grow so large so quickly to an average of 1500 visits every day.