As a general rule, hotels on the Strip are now charging to park.
MGM Resorts properties varies it a little from hotel to hotel. You can see those details on my MGM Parking post. I have another page with details for parking at Caesars Entertainment properties.
There are still a few places you can park for free, though. Continue reading Parking on the Strip
(updated Feb 1, 2019)
Caesars joined the ranks of other hotels to charge for parking. They allow a 1 hour grace period – the first hour of self-parking is free, but after that, you will have to pay to park at all Caesars properties except the Rio (which is off-Strip) and Planet Hollywood (which does charge for valet).
Hotel guests can charge the parking fee to their room, using their room key for access at all Caesars Entertainment hotels.
Total Rewards Platinum, Diamond and Seven Stars players receive free self- and valet-parking. Your Total Rewards card is used for access. Continue reading Caesars Las Vegas Hotels Parking Charges
The RTC’s official smartphone app, rideRTC is now available. It allows you to plan your trip, find a bus and buy transit passes, all on your smartphone. 
You can buy passes ahead of time and then activate them when you need them (similar to the way Monorail passes work). For full details, visit the RTC’s mobile app page.
The iOS version is available via iTunes here:
https://itunes.apple.com/us/app/ridertc/id909691507?mt=8
The Android Version is available in the Google Play store here:
https://play.google.com/store/apps/details?id=com.rtcsnv.rideRTC&hl=en
The RTC has also announced a number of schedule and route changes effective November 6, 2016. The Deuce and SDX are not affected. The full list is available here: http://www.rtcsnv.com/transit/november-6-2016-service-changes/
MGM Resorts in Las Vegas started charging for parking on June 6, 2016. If you use the Self-Parking garages, the first hour will be free. After that, the rates vary. Here are the details:
On Monday, I posted about my planning process for this trip. This is how it all turned out. Warning: This is a long narrative post.
Monday morning after only a few hours of sleep I headed to the airport. I got there at 5am for a 6:25am flight on Southwest. I almost missed the flight due to surprisingly long security lines. Continue reading 48 Hours in Vegas Trip Report