Every year we make a point of picking blueberries, both the cultivated kind (our local blueberry farm favorite is Dexter Blueberry Farm in Dexter, MI) and the tiny sweet wonderful wild kind (from various carefully guarded locations in Marquette County, MI). The freezer loses its springtime accumulation of beans to make way for frozen berries. Even now in April it's not too soon to start thinking about it.
I've been picking berries by hand for a long time, but there's tools that harvesters use when doing this for a living. A blueberry rake is a flat toothed scoop that pulls the berries from the plant without doing damage to the plant, much faster than doing the same by hand. The source I've found for these is Hubbard Rake Co in Jonesport, ME 04649, which advertises
In the spring of 1990, after several prototypes, Ike started the Hubbard Rake Company. The all aluminum rake has changed in design some in it's 15 years of existence to meet the demand of berry rakers. The totally balanced rake can now be bought in sizes ranging from 12T decorative rake to a 110T working rake.
Items available from the Hubbard Rake Company include: Hand Held Rakes for Harvesting Blueberries, (Low and High Bush), Cranberries, Huckleberries and herbs.
For more questions about blueberries, the US Highbush Blueberry Council has an FAQ list. They won't tell you where the carefully guarded wild blueberry patches are, though.
UPDATE: Michigan State University has a good Michigan Blueberry Facts site aimed at growers, which should be good too for blueberry lovers:
Welcome to the Michigan State University blueberry information website. Blueberries are a delicious fruit with many health benefits. Over 18,000 acres (~7,280 ha) of blueberries are grown in Michigan, the largest blueberry-producing state in the US. This website aims to provide information on all aspects of blueberry production and blueberry health management. While the information is geared toward the Midwest, much of it will also apply to other blueberry growing regions.