Magento 1.8

Magento 1.8 Development – Recently magento have upgraded to its latest version from magento 1.7 to magento 1.8 , As the largest magento extension provider we have upgraded our magento extension to latest magento 1.8 version https://store.webkul.com/

most of the magento 1.8 API and code structure is almost same as per the magento 1.7 but there is a major overhaul in tax , cache and Redis

Main changelog of magento 1.8

Major overhaul of tax calculation formulas, correction of rounding errors, and additional assistance with configuration.
Optimized cache adapters for single-server systems
Upgraded Redis cache adapters for multi-server systems.
To set up and use Redis with Magento, see Using Redis with Magento Community Edition (CE) and Enterprise Edition (EE).
Eliminated many types of database deadlocks.

also tons of security issue has been solved

Security Enhancements

Errors are not displayed in a new Magento installation.
Fixed a session fixation vulnerability in the new user registration process. Attackers can no longer abuse this flaw to take over new user accounts during registration.
Prevent a user with limited privileges to delete the Magento installation.
Prevent attacks that use OAuth to leak sensitive information to an attacker that knows the consumer key and user token.
Resolved an issue that enabled attackers to gain access to billing information.
We thank Darryl Adia (from Ampersand Commerce) for contributing to this fix.
Resolved issues with the security of OAuth tokens and keys.
A remote code execution vulnerability was fixed.
We thank Bastian Ike for contributing to this fix.
The Magento Admin Panel and web stores no longer allow web browsers to store user names or passwords.
The Magento web store has additional Cross Site Request Forgery (CSRF) protections, meaning an imposter can no longer impersonate a newly registered customer and perform actions on the customer’s behalf.
The cryptographic methods used to store passwords were improved to enhance security.