>- Bug fixes: it's tempting to offer "free bug fixes forever" but that's not realistic. Clients must realize (be told if necessary) that all software has bugs; they may find obscure ones literally years later; or that something doesn't work properly now that they're running it on Windows 2008. I don't offer free bug fixes in writing beyond 1 year, and in most cases 3 months. However, if they hit a significant, reproducible bug beyond that period I'll typically still fix it for free, to build goodwill and improve the product.
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Whether you fix bugs for free should also depend on whether the project is fixed price (in which case, essentially, you promised running code) or paid hourly in the first place. Most of my work is hourly and my standard contract says that I'll fix bugs at my then-current rates for two years. After two years (actually, after two years after the contract is terminated), I have the choice to not fix them.

Tamar