I can understand the confusion that ensues when starting a sentence with "I wonder" and thinking that it should be followed by a question mark. I likely once succumbed to that trouble many moons ago. But, there are so many occasions where it should be simple what you are trying to convey, that you should be able to employ the proper punctuation for the occasion.
Now, let's get to exclamation marks. Sir Terry Pratchett says this about their use in various books, and here are a couple of examples: "Five exclamation marks, the sure sign of an insane mind." or "And all those exclamation marks, you notice? Five? A sure sign of someone who wears his underpants on his head."
People are using them awfully much. Give them a break! I've read in an article about proper text message etiquette when using punctuation--that punctuation should hardly EVER get used in texting unless absolutely necessary. That should be how it is with email and other media.
To round this all up, I'd like to shed some light on a punctuation mark that I feel needs attention, something that was created in the 60s and should be nominated to be inducted into the hallowed hall of fame that is our universal keyboard. This punctuation mark is called an interrobang, interro from interrogative. An interrogative sentence is one that ends with a question mark. The bang, apparently, is slang for that shock one gets when inserting or reading a sentence with an exclamation point. I've not had much luck inserting an interrobang in this digital media and these different software programs, but I can get it to work on MS Word. Just check its history out on Wikipedia.org. It's enlightening.
Lastly, notice how few exclamation points I've used in this post. If you're interested in more, check out Slate.com's article (http://www.slate.com/id/2173076/) on the topic or this bit on Wiki.lspace, a brief overview of Pratchett's take on the issue (http://wiki.lspace.org/wiki/Multiple_exclamation_marks/).
Spread the word, and encourage others to not be bang-abusers.
One more link you could check out: http://www.tor.com/blogs/2011/03/bang-how-the-exclamation-makes-us-into-comic-book-characters
Dan
