Part 3...

Other apps I use:

BeeJiveIM - I have friends in other countries and this lets us keep in constant contact. A great app using the Apple push technology.
Occasions - I'm useless at keeping track of birthdays, anniversaries, holdays etc. and this app has fixed that. It comes with all major holidays built in for each country which you can activate as and when needed and pulls data out of your address book for contacts. Add to that Facebook sync to pull friends dates and this is a truly brilliant app.
Momento - I like to journal a little from time to time. This app gives you that as well as pull in your posts from your social networks such as Twitter and Facebook. It's a real work of art.
Reeder - I like to read my RSS feeds though Google Reader and this app uses that service to allow you to continue reading them on the iPhone. By syncing what has been read you never see the same post twice. And again, it's a fantastic looking app.

I have a lot of apps on my iPhone but reguarly try to keep them under control.

Part 2...

Things - ok, the one that I find most difficult. I own Things, PI, To Do... just about all of the main task managers for the iPhone. Personally I use Omnifocus for the one reason you mention in your post, the need for cloud syncing. I own two Mac's and one iPhone and the idea of having to get them all on the same network to have them all in sync is not practical for me. Add to that the iPad when it becomes available and the need for cloud sync becomes even more important. CulturedCode have long promised over the air syn and have failed to deliver which is a shame because the Mac app is a work of art.
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Great post. I always find it really interesting to see how others are using the same devices that I am.

Here are some comments and contrasts to your list:

CalenGoo - personally I prefer Pocket Informant (PI) for this exact need. PI has a long history on the Windows Mobile platform before the developers, WebIs, released an iPhone / iPod touch version. PI syncs with GCal for events and Toodledo for tasks. The developer is extremely open with his plans, progress and problems with the iPhone platform.
Evernote - Yep, I'm with you there completely! The more developers that utilise Evernote in their apps the better.
HootSuite - It does do the one thing that annoys me most about my Twitter clients, keeping me in sync. I do like the service as well, nicely designed. On the iPhone Twittelator Pro is still king for me.
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The book sounds interesting to me and I would like to investigate it further. I am however also interested in the negative comments that are mentioned above. I haven't had the time to research this further so if anyone can point me at a 'good' negative review (if that makes sense) then I would appreciate it.

Also as a UK resident I have no access to a Kindle device. I would like to know if there are any options to buy this book as an ebook other than for the Kindle? A quick search on the internet produced no obvious hits although the book is new so I may be looking too soon.