5. RS Technology Fund ( RSIFX), up 37% this year. This $300 million fund is typical of the top-performing technology funds, with its roller-coaster performance: It gained 75% last year after losing 51% of its value in 2008. The RS Technology Fund's portfolio of 66 stocks has a 128% annual turnover. Its top stocks are familiar: Apple ( AAPL), at 6%; Google ( GOOG), at 4%, and down 5%; and IBM ( IBM), at 4%, and up 13%. And then there are a handful of stocks with off-the-charts performances, including: FS Networks ( FFIV), up 170%; Finisa ( FNSR), which makes products used to aid high-speed data communications over local area networks, at 2%, up 184%; and Acme Packet ( APKT), a provider of voice-over-Internet-protocol technology, up 413%.