Matamoscas Game: You need two fly swatters. Put a ton of different vocab words in Spanish up on the board or projector screen. The more words, the more difficult it is. Split the class into two teams. Have a student from each team come up to the board, and say a vocab word in English and they need to race to hit the vocab word on the board. Click for an alternative way to play.
Memrise is a web tool that is aimed at helping users to learn words from any language. The site is completely free, and users can share their favorite words and definitions with their group of friends or colleagues. The information about the words or phrases contains videos, examples, and other great multimedia snippets that make it easier for visual learners to commit these new words to memory.