It seems that you have three choices in deciding how you write tags for your blog posts:

1. Make them user friendly
2. Make them highly searchable
3. Combo of the two

For example, let's say that I have a blog post that has write-ups on the top 10 ipad apps for business travel (e.g., Evernote, Dragon Diction, Instapaper, etc.).

1. User friendly tags: ipad apps, business travel
2. Searchable keywords (analyzed with Google Keyword Analyzer): ipad apps, ipad travel apps, evernote ipad, instapaper, instapaper ipad
3. Combo: ipad apps, ipad travel apps

So my question comes down to this: which is really the best choice -- 1, 2 or 3?

Note: this visible post tags will also serve as the meta keywords for the post page.