Are the lines between nonprofit and for-profit ventures getting ever murkier, asks a new post in Give and Take, The Chronicle’s roundup of the best blog posts about the nonprofit world.

Plus:

• Tony Blair enters a new phase of life: building a career in philanthropy.

• A New York pastor resigns due to salary controversy and other concerns.

• Aid groups are spending more money on security, survey finds.

• Dueling research on foundation grant making sparks debate.