My client has been crashing frequently (14 times today). It usually (but not always) returns me to the launcher upon crashing.
I haven't spotted a clear pattern as to when the crashes occur, though it does only seem to occur when I am interacting with the game, not while I am away from the computer.
Both the client and server are 1.7.4, both unmodded.
Crash reports from today's 14 crashes are attached.
Ready and willing to gather more data if needed!
Linked issues
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Many thanks - I updated my drivers and had a whole day without crashes. Seems pretty conclusive 🙂

🙂
Crash in NVidia graphics driver:
Please update your graphics card drivers following these instructions: Updating Graphics Card Drivers.
If you are using Java arguments to increase the amount of memory, please reduce it to the default 512MB.
Do not rely on automatic searches for driver updates.
Do not use Windows Update or Device Manager - Microsoft doesn't install OpenGL, they promote DirectX.
If you know the brand and type of your graphics card, go to the links provided above and search manually for the most recent driver for your card. The automatic detection tools of the card manufacturers are not recommended.
If all that won't help, please use the Mojang Support Center.