If you're mostly sending browser links, you can use OmniFocus' Mail processing abilities to good effect. Set up an email account in the OmniFocus Mail preferences, check the box to add the Mail rule, then just mail the links to that address and they will appear in your Inbox when you next open the Mail program on your Mac. It can be beneficial to use a separate account for this because if the message gets read elsewhere before the Mail program runs, the rule won't be triggered and you won't get the message contents transferred to OmniFocus.
If you want to mail yourself actions from possibly arbitrary email accounts, see
http://people.omnigroup.com/dave/link-o-tron.html which generates messages that can come from any account (unlike the setup above, where the sending account has to be registered with OmniFocus in advance), but you'll need to click on the link in the message when you receive it to actually add the action to OmniFocus.