Tips and Tricks on where to leave your website links and details online.

Directories:

Web directories are just like phone books or Yellow Pages, except this time online. Submitting your site to online directories is highly recommended as it improves your site’s SEO (directories link back to your website). Make sure you also submit your site to regional, local and niche directories where your clients are most likely looking for you.
Scrub The Web
DMOZ
Entire Web
Exact Seek
Amfibi
Directorise
Hitalyzer
WhatUSeek
Link Centre
So Much

Social Bookmarking:

Bookmarking your website in popular Social Bookmarking sites is surely a great way of gaining quality backlinks as well as exposing your site to a more broader audience.
Stumble Upon
Delicious
Clip Marks
Blink List
Tagza
Diigo
My Link Vault
Connotea
Links Marker
Faves