>>Speaking of snow (inspired by another thread), what's the story about >>cross country skiing? It looks like it might be fun.
It's very fun!
>>I enjoy downhill skiing, and hiking, but wonder if a change of pace might be nice in the winter.
XC skiing is like hiking, only faster!
>>Is any gear needed that wouldn't normally be obtained in a rental situation?
Rentals generally provide skis, poles, and boots.
You will need clothing, water, food. Clothing is key. You need to be able to add layers on when you stop, or when the weather changes. Select clothing that stays warm when wet. If you are a runner or a hiker, some of your gear will be useful.
>>Are there unique safety considerations?
Be able to stop! Generally not a problem, you can always just fall down. Don't ski off a cliff! That would be bad.
In the backcountry, avalanches are a risk. This is mostly a concern for backcountry campers and advanced skiers. It is not a significant risk at resorts along groomed trail.
>>How does one select a suitable trail?
Glacier Point Road is groomed and tracked in winter. Just remember that it's uphill most of the way back...
The ski to Taft point is also excellent, but not groomed. You are rewarded with a view!
For trail selection, you will want to consider whether you want a groomed track, or if a rough trail is OK. As in hiking, there are trail books.
The style of skiing that you use, and the type of skis you have determine whether you need a groomed trail or not.
The Yosemite mountaineering school used to provide lessons. They probably still do. XC ski resorts can provide rentals and lessons.
Other resorts I like: Royal Gorge (Truckee) and Bear Valley (along route 4).