DXL - 11:31 pm on Feb 1, 2007 (gmt 0)
If its a prospective client, I'll call them back or email them immediately if I'm not working on something due within the next few hours. If I'm pretty busy, I'll reply the next day. There are occasions when I landed a client by being the first person to respond to them after they contacted a few different firms, so sometimes it pays to be prompt. Honestly, I also weigh in what I think the project might be worth.