Having your website indexed in 24 hours is not that hard, most people will tell you that in order to be indexed, it will require 30 or more days, and that is if you are even indexed then. This is simply not true. Here are several ways to be indexed within 24-48 hours.
First, correctly setting up a blog will get you indexed within 24-48 hours max. Search engines love content and blogs are the primary approach to increasing your targeted traffic. Create a free blog using Google's blogging software, it is free and easy to setup. Go to http://www.blogger.com and get indexed fast.
Purchasing links on high pagerank, related websites will get you indexed quickly too. Search engine use related inbound links to your site as the benchmark of the importance of a website. Having a link on a high-ranking website will get the site indexed as soon as the crawlers visit the page again. This is usually within 24 hours, on a site that has a pagerank of four or better.
Participate in forum discussions; be sure to include a link back to your website. Established, relevant forums are the best approach to use. Once the search engine visits their site to index, again they will read your link and follow it to your site. Very active forums are often indexed on a regular bases, as search engines love content.
Article writing is a very effective way to be indexed quickly, article directories like EzineArticle's are very popular and are indexed on a regular basis, again search engines love content and where better to find fresh content then a website that has hundreds of new articles posted every hour.
The key to being indexed quickly is to have links that are posted on websites that are indexed on a regular basis. Once a site is indexed, you can begin the process on increasing your search engine placement and drive traffic to your site using search engines.