Motorola and Verizon Wireless on Wednesday got around to delivering what's been promised to owners of the Xoom tablet for several months: 4G LTE. When the Motorola Xoom first went on sale early in 2011, buyers were told that they'd eventually be able to send their 3G-wireless-equipped tablets to a workshop where they'd be upgraded with faster 4G wireless hardware free of charge. The upgrade was promised to come in the first half of the year. Verizon also announced the upcoming availability of a Xoom that comes with 4G technology pre-installed. The Xoom has been on the market since February, when it debuted as the first tablet to feature Android Honeycomb, a version of the OS designed specifically for tablets. It was initially viewed as a worthy iPad competitor, though its sales took a hit when Apple (Nasdaq: AAPL) released the iPad 2 a few weeks later. Through the process, Verizon maintained the 4G version of the Xoom and the upgrade offer would be available by the end of t...