By the time I answer this question there are ~285,000 iPhone / iPod Touch apps on the iTunes App Store.
easily 16 apps per page
if all you have is apps, then 16 GB.
As of May 17, 2010, there are 202,064 apps for the iPhone and 6599 for the iPad. Go to appshopper.com to find current numbers
There a many good iPhone blog apps. The most common blog app would be snap guide.
Apps are constantly being created, so roughly 10 apps are made everyday.
it has 27 apps
You buy the iPhone app
apple create the apps on iPhone
There are many of free news apps on the iPhone. Some of the top news apps are APMobile, The New York Times App, and NPR News iPhone App. You can find these in the App store.
it depends on how many gb's you have.
It is not bad in itself to have a lot of apps on your iPhone. Some negatives may be if many apps are open at the same time it may slow down your phone and having many apps may take up a lot of space.