The work, it never ends!
I dunno about you, but whenever I've thought of heaven I've never thought of it as a place where I'd have to work. Although if you asked me what we'd be doing in heaven, I really couldn't tell you, apart from knowing that we'll be praising God.
It's not inconceivable that we might be praising God all the time once we meet Him face-to-face (we probably wouldn't be able to help ourselves, once we're confronted so fully by His awesomeness), but... even right now, we're called to worship Him all the time, right? In everything we do? So if we're already worshipping Him constantly while going through our daily lives and routines, maybe we won't need to be worshipping God by just sitting in one spot and playing the harp all day after we die. What a thought :P
Our conference speaker pointed out that God, in the Bible, talks about a "new heaven and a new earth"; not just that, but a "new Jerusalem" (see Revelation 3:12, 21:2).
What is Jerusalem? A city. What are cities built on? The products of men's & women's work. Buildings. Technological innovations. Marvels of engineering. Scientific discoveries. Arts and literature. Culture. Products and services.
Our conference speaker thinks we'll still be working in heaven. We'll be working in the "new Jerusalem". We'll continue carrying out God's mandate of exercising dominion over all creation through our work. Not only that, the speaker also believes that the best of man's work will be in the new Jerusalem -- renewed, restored, sanctified, whatever you want to call it. Works of art, feats of architecture, things of beauty...
If this is true, it looks like heaven won't be that boring after all. And, as Ariel said... "I wouldn't mind working in heaven -- I doubt there'd be stress!"