dont ask, just go and get them. there are ton of ways to get one way links without asking for it. you can ask but think about it, why would people link to your site? it takes a site owner time to setup the link for you and it will only happen if your site is non-commercial resourceful website. time you will spend finding site owners and emialing them asking fo rlinks, you can use that time to build links in more efficient manner. you can read my recent blog feed to learn several ways of free link building