I use a dedicated gmail address. Here's why: (1) It's portable. I can send myself an email from my phone, laptop, ipad, etc. (2) It's searchable. I can go back and search for specific keywords or topics I wrote about. (3) It's easy to organize. I can label my posts as personal/work/etc and setup filters to apply these labels based on the subject line. (4) Short learning curve. I use my personal gmail account everyday. & (5) It's relatively secure.
Edit: (6) It's free.