TextEdit doesn't get much love. BBEdit, SubEthaEdit, and so forth grab the spotlight and all the attention. But I'm a TextEdit gal. I love the Emacs-like support and the price tag. For years now, I've resorted to Lorax's textextras to get "go to line". It's critical when you're debugging and you need to check out, for example, line 572.
Enter Leopard. A new standard option in TextEdit allows you to select by line using the same Command-L, I've been using for years. You don't have to use the mouse. Type Command-L, the line number, and and press return.
Sure, the error message for a bad line number is geeky ("Out of bounds line specification") but who cares? Line jump! Joy!