Blogs - How many should you have?

I just got through watching Elizabeth Gilbert's TED talk on Creativity. During the day I find thoughts flit through my mind that I want to expand upon. The trouble is that I almost never have a notepad or computer with me at the moment to capture them. Or perhaps I lack the discipline to capture the outline without going through the details or job flexibility to devote an hour or 2 to and idea when it strikes me. (That's the great thing about twitter, you only have to produce one short sentence.) Either way, my creativity wants an outlet and so I plan to restart blogging again.

The prevailing school of thought on blogs and twitter accounts is that they should stick to one topic. I have a wide range of topics I'm interested in writing about, and would like to find a way to manage all of that in as small a number of blogs as possible. The list of general subjects would look something like the following:

• Computer Science and Information Technology - This is my profession and educational back ground. Today I was thinking about writing about problems that can be solved by buying more hardware and those that have to be solved with better software, and how the non-computer-scientist (management) could learn to tell the difference.
  
  
• Technical solutions to problems in Computer Science and Information Technology - A place to put solutions I have found that I couldn't find easily elsewhere.
  
  
• iPhone development - Like above but specific to iPhones
  
  
• Music, Audio, and Classic Speakers - I love music. I have the affliction of being an audiophile. I collect classic speakers and occasionally build my own. If you have never sat in the dark and listen to music you loved, do yourself a favor and do it tonight. I'm serious find some music that speaks to your soul, cut off the lights, put down you gadgets, close your eyes and just listen for 5 minutes or 50. One of my resolutions is to make the time to do this more often!
  
  
• Investing and Financial Planning - Sometimes I wish to make a radical career change and go into money management. I actually enjoy pouring over 401K options and making investment decisions.
  
  
• Taco/Food Trucks - I did work on this iPhone app after all.
  
  
• Things like my last post here.
  

So can I put all of this together in 2 to 4 blogs without totally alienating the readers?