Score101 - FWIW you can do an advanced search by date that will sort by most recent. I did a search on the topic and got two pages worth for 2011 alone. As you said there are some interesting posts.
cdjd13,
Let's start off with a definition: Unofficial visit - Any visit by you and your parents to a college campus paid for by you or your parents. The only expense you may receive from the college is three complimentary admissions to a home athletics contest. You may make as many unofficial visits as you like and may take those visits at any time. The only time you cannot talk with a coach during an unofficial visit is during a dead period.
What you can expect is that your son will be evaluating the college, girls, academics, dorms, library, coaches, infrastructure, other students, & overall program to see if this is a place he wants to go to. Remind him it is for 4 years. The college coaches (and possibly players) will be evaluating him as a potential recruit or future teammate. The coaches want to know if they should continue to recruit your son. I look at it like dating.....it is like a first date. Bottom line.....Is there enough interest and compability between your son and the program to continue the athletic recruiting process.
Your son can expect questions about his grades, intended major, interests, summer travel team & upcoming schedule. I would dress appropriately (business casual). I would let your son handle the arrangements, and communication on his own. If it is out of town or a long drive, you could go with him but let him meet with coaches on his own. Hint: While your son is meeting with the coach, you can set up an appt with Financial Aid to get some information. Many parents I know did their own un-official visits while their son was busy with the coach.
Your son should ask questions of the coach that relate directy to his program and your son's potential 4 years there. I would research the heck out of the program including depth & class at each position. Specifically, I would ask about tutoring, athletic expectations, challenging majors & how they work with you, typical day in-season, typical day out-of-season, summer baseball requirments, scholarship questions, and any other specific questions he has. There are couple older threads that deal directly with just questions that are pretty good. I would also ask "who have been your best players, and how did they become your best players". I've heard many coaches open up when asked that question, because they are very proud of their program & players.
In summary, unofficial visits can be very helpful in determining if a school is still interesting. From the schools perspective it is very good because there is no limit to the amount of hours you can spend on campus, it is on your dime, and you can make unlimited visits. Recruits will come up with all kinds of reasons they like or dislike a school. I've seen it with my two oldest sons and heard from others about their un-OVs. You really learn alot about your son in this process. Best of luck.
PS - Always have your son follow up (email or phone) with the college coach that spent the time to host your son regardless if your son likes the school or not.